ChrisSpace

Is this alternate solar system possible?

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So I have just started an alternate history project in which the solar system forms very differently from Our Time Line (OTL). What this results in is a very different 19th, 20th and 21st century as space colonization becomes available even to the European Imperial nations. In any case, before I start I just want to check that the alternate solar system I have designed is even possible, taking into account things like orbital physics and planetary climates. So, here's what I have so far:

-Sol is the star in the center of the system. Can cause blindness when looked directly at for a long time. For simplicity, it has the same characteristics as in OTL.

-Vulcan: (0.071x Earths Mass) Vulcan is the closest planet to the Sun, and is a Lava planet. Due to its closeness to the Sun, it is very hot. Vulcan is close enough to the Sun for more than half of the planet to be molten. It is largely composed of dense Iron, metals, and Iron/Metal Compounds on its sun-facing side, as due to its proximity to the Sun, all of the lighter volatiles and silicates characterizing most planets in the Solar System boiled away, at least on its Sun-facing side. The proximity of the planet to the Sun exerts a lot of gravitational energy on Vulcan, making it tidally locked.

Lava oceans cover the Sun-facing side of Vulcan, while (due to heat from the opposite side of the planet moving towards the night side) the night side is dotted with Volcanoes and Lava lakes, puncturing the thin Vulcanian crust. These emit large amounts of Carbon Dioxide and Sulphur into the atmosphere of Vulcan. However, the Sun's powerful solar wind blows away much of the accumulated gases (including silicates and other normally solid material) into space a very high speeds- consequently, from far away, Vulcan looks a little like a comet. This is how it has been visible since ancient times.

The night side, however, is relatively cold, (compared to the day side) meaning silicates (and under rare circumstances, ices) are present here. Due to this difference in temperature, the atmosphere can condense, form clouds, and solidify on the night side, forming a silicate 'rain'. However, this is uncommon, as these materials are generally blown away by solar wind before it has a chance to precipitate. Vulcan is somewhat larger than Mercury in OTL, and like Mercury, lacks a proper magnetosphere. [0.45 G] PLANET (12° Inclination) {0.17 AU}

-Mercury: (0.055x Earths Mass) Mercury, as in OTL, contains many valuable minerals, being an “iron planet” composed mostly of metallic material. A less eccentric orbit means it is tidally locked. [0.38 G] PLANET (7°) {0.3 AU-0.47 AU}

-Venus (Native name Avelia): (0.815x Earths Mass) A habitable planet orbiting at a high inclination in resonance with Earth (avoiding high gravitational interactions with it that would sling it out of its orbit.) It has a (somewhat thick) atmosphere, magnetic field and a surface much different from OTL. Despite being habitable for life, it is a relatively dry desert planet, and lacks large animals, as there is not enough water to support the amount of plants needed by large animal life (aside from its intelligent species, which we will get to later). The surface water available is concentrated in a few small oasises. The surface terrain is composed of flat plains, and high, volcanic plateaus- most of which merged into one large plateau near the equator where Aphrodite Terra is OTL (these form as Venus lacks the water for tectonic plates). The air has a 17% O2 content (with the rest mostly nitrogen), and the surface temperatures average 40-50° C. This makes the planet uninhabitable for unprotected humans in most areas, though the air is breathable for many. Aphrodite Terra contains high concentrations of Uranium-235 for nuclear weaponry, Gold, and Platinum-Group minerals for mining.

Venus is also one of the places outside Earth that has intelligent life, which at the time of first contact was a small, feudal, agrarian society. This is strange, as the planet lacks large animals and significant arable land. The intelligent life here is very limited in number due to only having a few areas on Venus with enough water to support them (desert settlements are small and isolated, and look a lot like those on Jakku or Tatooine in the Star Wars series). This also limits their technological advancement, though they love and greatly value the technology they DO see and/or obtain (much like the Manus islanders in OTL).

Oh yeah, and the first man to step foot here was Simon Wolf Edmunds, and thus the first base here was called Edmunds' Step. [0.9 G] PLANET (40°) {0.8 AU}

-Eros: (0.0000075x Ceres Mass) Venus' only moon, Eros has a very eccentric, somewhat inclined orbit around Venus. It is likely a captured near-Venus asteroid, and being a S-type asteroid, is depleted in volatiles (for refueling), but higher in metals (such as gold), compared to C-type asteroids. Very similar to 433 Eros in OTL. [Negligible G] MOON (10.8° Inclination to Venus’ Inclination) {0.8 AU}

-Earth: (1x Earths Mass) Same as IRL. Ignoring the effects of tidal locking, due to storyline purposes, it is a binary to Luna. It also is the home world of the most advanced species in the solar system – according to members of said species. [1.0G] PLANET (0°, in relation to Sun (Constant Format used throughout for objects orbiting the Sun)) {1.0AU}

-Luna: (8.13x Moon Mass) Earth’s only large moon. It has a magnetosphere (formed by tidal heating), a biosphere and breathable air. It isn’t tidally locked, so ancient astronomers have been able to see both hemispheres. (Yes, I know this isn’t possible in real life, but I’m keeping it this way for the sake of the storyline). Luna is composed of similar material to Earth in OTL, and can be considered Earth's smaller “brother” or "sister" or "gender-neutral chibi thing" (it is a little smaller than Mars in OTL). Its atmosphere extends much farther above its surface than Earth's due to its low gravity. It also is slightly cooler than Earth due to a thinner, yet still breathable atmosphere. It has intelligent inhabitants, however they are far inferior to most other intelligent species as they were still getting used to ideas like "fire" at the time of first contact in 1946.  [0.36 G] PLANET/MOON (0° Inclination, in relation to planet (Constant Format used throughout for objects orbiting another object)) {1.0AU}

-Aurora: (Undecided Mass) Moon of Earth, thought to once have been a metal-rich “M-Type Asteroid”, it contains concentrations of platinum-group metals that made it the moon that paved the way for asteroid mining. It is at an inclined, eccentric prograde orbit with Earth-Luna's barycentre- though this orbit is unstable, and the object will likely collide with either Earth or Luna in a few million years due to gravitational interactions between its larger neighbours. Aurora is relatively small, however, it is about the size of 3554 Amun (actually, the two are pretty much the same). It is not tidally locked, however, as Luna's and Earth's gravity are in a “tug of war” with the moon. Aurora is surprisingly sparsely inhabited due to the fact it is used by multiple nations as a testing ground for extremely powerful weapons that shouldn't be experimented with on Earth. [Negligible G] MOON (27°) {1 AU}

-Phobos (0.000012x Ceres Mass) and Deimos (0.0000016x Ceres Mass): Now binary trailing Earth Asteroid Trojans. Otherwise, same as IRL. Both have similar compositions, and Phobos lacks the stress stripes caused by its proximity to Mars.

A strange “library” containing “monoliths” (Quantum Computers with massive, ultra-long-duration hard drives containing huge amounts of unknown data) has been found here, however- one of the greatest mysteries of the Solar System. Humans are still yet to decipher its data, but as computer technology advances, strides are being made to do so. One theory is that it was from a collapsed ancient civilization, or that it was left behind by its creators for us. [Negligible G] ASTEROIDS (14°) {1 AU}

-Comet 109P/Swift-Tuttle: (0.0069x Ceres Mass) First discovered in 1846, Comet Swift-Tuttle is a periodic comet with an orbital period of 133 years. Though this comet's orbit is stable due to a 1:11 orbital resonance with Jupiter, it passes very close to Earth/Luna-in OTL, it will approach 0.03 AU to Earth.

In this alternate timeline, its orbit is determined to pass a minimum of (0.0003 AU) to the Earth-Luna system in 1969- dangerously close. As a result, it generates significant scientific study on the comet's orbit, and how to mitigate a potential impact. As 109P in OTL and this timeline have very similar properties, they both have a 26 km nucleus of similar composition- combined with is high-energy orbit, an impact would have 27x greater force than the impactor that cause the Cretaceous-Paleogene Extinction Event.

Two manned spacecraft were sent here to push the comet out of the Earth impact corridor, using a Jupiter flyby to match its inclination- named Freedom and Independence. [Negligible G] COMET (113.45°) {0.96 AU-51.23 AU}

-Mars (Native name Koppon): (0.12x Earths Mass) Mars is one of the three places outside of Earth with intelligent life and one of the most complex biospheres in the solar system. It has a proper magnetosphere (due to its large moon causing tidal heating in the core) allowing it to retain a breathable atmosphere and a habitable, but relatively cold climate, due to its distance from the Sun and thinner atmosphere- the polar regions to 50°N and 50°S are in a perpetual ice age. Most of the rest of Mars is composed of the Mars equivalent of Tundra, and Boreal Forest. Additionally, the Tharsis Bulge does not exist- due to plate tectonics. Instead, it is a large plain (like the Midwest) with large shield volcanoes and mountains on its western edge. As the Tharsis Bulge pushed Arabia, on the other side of the planet, up, the plains of Arabia are also underwater.

Mars' intelligent life was the most technologically advanced other than humanity at the time of first contact, with a technology level only about 50-100 years behind Earth. The fact humanity and the Martians have developed so close to each other chronologically, and the statistical improbability of this, has raised several interesting theories. Its intelligent life was not expected to be killed off by Smallpox and Measles shortly after the first manned landing in 1952, as the difference between species living on Mars and on Earth is so great- despite this, there was a large kill-off after (unknowingly) tainted goods were traded between Mars' intelligent life. Still, this only wiped out about 40% of the population, compared with more than 90% in Australia and the Americas in OTL.

Mars is also slightly larger in size, compared to Mars in OTL. As this planet is largely dry, much drier than Earth (due to low amounts of evaporation from its cold climate), it is considered a cold semi-desert planet by some scientists. It is the most Earth-like planet (aside from Luna), but lacks precious minerals and/or resources and animal biodiversity of Earth (due to less O2 produced from the partially-frozen over planet). Its atmosphere is 20% oxygen and 68% nitrogen (the rest mostly noble gases) - breathable. Mars is currently similar in population to Luna, but the recent discovery of large oil and Thorium reserves (which also indicate a vastly expanded biosphere in the past) is bringing that up considerably. [0.38 G] PLANET (1°) {1.3 AU}

Bellona (Martian name Eke): (0.011x Moons Mass) Mars' only moon, about the size of Ceres in OTL and based off Ike in KSP. Bellona and Mars' compositions are similar, having formed from the same material. It is almost in hydrostatic equilibrium (but not quite), so it though it looks round at first glance, it is not completely rounded, like Ceres. [0.05 G] MOON (4°) {1.3 AU}

Minerva (Native name Nemixis): (8x Earth Mass) The largest rocky planet in the solar system. Its high gravity and large magnetic field (due to active volcanism) have let it develop a large, dense atmosphere, which, though similar to Earth's, is unbreathable due to the high concentrations of CO2 (above the human tolerance of 5mm partial pressure of CO2) to humans, but is perfectly suited to the native life, which is adapted to the conditions. Though there are large concentrations of CO2 on this planet (1% of Atmosphere), it is otherwise similar to Earth's Atmosphere. The Greenhouse effect from CO2 and evaporating water (water planet means more vapor) causes this planet to be habitable, despite its distance from the Sun.

Minerva is also one of three places outside of Earth known to have intelligent life, which is not highly advanced (compared to those of Venus, Earth, and Mars), but uses its ability to survive in an atmosphere mostly unsurvivable to humans to its advantage. Minerva is mostly like Laythe in KSP, but with much deeper oceans- as most of the continents are underwater, with only the mountaintops remaining (meaning the land that there is is slanted, and usually not optimal for agriculture). The planet has a very low axial tilt of 1° (though this is thought to have changed significantly over the years, due to a lack of a moon, ranging from a 0-30° axial tilt.) meaning that there are no seasons. This, along with the lack of land, means that civilization is unlikely to advance much farther than basic agriculture without extra help. It contains unusually large concentrations of minerals, such as Silver, Titanium, Zirconium, Gold, and Rare Earths, and the deepest areas, 90 km deep, contain strange, exotic ices, due to their density. (Platinum-Group Metals and Uranium are also available, but at lower concentrations than on Venus.) Of course, extracting these minerals require mining underwater. The atmosphere is very similar to Earth. Minerva also has large reserves of oil and natural gas, due to its oceanic nature. [1.8 G] PLANET (2°) {1.8 AU}

Ceres: (0.013x Moons Mass) Same as in OTL, but in a more inclined orbit. Also is surrounded by a very, faint, young ring, thought to be debris from an asteroid impact that took place a few million years ago. [0.04 G] DWARF PLANET (15°) {2.97 AU-2.56 AU}

Dres: (0.017x Moons Mass) A Ceres-like protoplanetary object slightly larger than Ceres in OTL. It is similar to Dres in KSP 0.90, with large canyons likely formed when the moon underwent thermal expansion. It has a very eccentric orbit. [0.04 G] DWARF PLANET (5°) {2.5 AU-3.1 AU}

Jupiter: (317.8x Earths Mass) A gas giant, Jupiter is also the 2nd largest planet. It is basically the same as in OTL, but with a very different system of moons. [2.528G] PLANET (1.3°) {5.4 AU-4.95 AU}

Laythe: (9.3x Moons Mass) The closest moon to Jupiter, Laythe is very similar to its version in KSP (but larger)- an ocean moon. However, due to tidal locking, its vast oceans are pushed to the poles, leaving behind the land in islands clustered near the equator. Unfortunately, Laythe's tides are impressive- due to the gravitational forces from Jupiter and Castillo, these tides have more resemblance to tsunamis on Earth than tides, making the land completely useless! Though the tides hinders complex land life from growing, it has a breathable atmosphere, strong magnetic field (powered by Jupiter's tidal heating of the core) and many diverse aquatic ecosystems.

Additionally, Laythe is very volcanically and tectonically active, spewing CO2, which is absorbed by cyanobacteria- however, these cannot support complex life at the surface, due to the lack of sunlight; all life here is deep-water, making use of thermal vents to survive (although many of these vents are in shallow waters). Additionally, the oceans are acidic, due to absorbing large amounts of CO2. Due to the lack of land and Sun, Laythe has an unbreathable atmosphere with a mere 10% oxygen, and composed of mostly nitrogen, with significant amounts of CO2 and Water Vapor. However, the greenhouse gases also makes Laythe an average of 17° Celsius. The moon also lacks a giant impact crater, like Laythe in KSP (as this may have shattered the moon apart). Laythe is between the moons Io and Europa in OTL. Human missions getting here suffer (such as the “MILLER” planetary lander/human precursor sent here, which was quickly consumed by an unexpectedly large swell, or "MILLER2" who's last recorded transmission was "OH **** WHAT THE **** IS THAT SHOOT IT SHOOT IT [indecipherable screaming]!") due to the radiation belts around Jupiter, that Laythe is protected from, but in the middle of(though some still evaporates, as the low gravity means Laythe's atmosphere extends much farther out than Earth's). Though it has large amount of precious minerals mine-able underwater, Laythe has largely been designated a “no-go” zone for human missions- leading to the famous quote, “All these worlds are yours, except Laythe. Attempt no landings there. If you do attempt to land there, you probably deserve whatever happens to you.” [0.37 G] MOON (0°) {5.4 AU-4.95 AU}

Castillo: (1.46x Moons Mass) The only other major moon of Jupiter, Castillo is much like OTL. It contains a global ocean under its icy crust and mantle, containing a surprisingly large biosphere. It is a good staging point for a base, being away from Jupiter's radiation belts, (not to mention useful land, and volatiles to fuel ships). It is somewhat closer in to Jupiter than in OTL, allowing the two moons Laythe and Castillo to form a resonance and stabilize their orbits. Unlike in OTL, however, it did get hot enough during formation to be differentiated. Castillo is the most distant body in the solar system with a permanent population as of 2018. [0.12 G] MOON (2°) {5.4 AU-4.95 AU}

Saturn: (95.16x Earths Mass) A gas giant. Unlike in OTL, it lacks large, noticeable rings- the processes that formed the larger rings did not take place here (though Saturn still has smaller rings, such as the F-ring). Also, in the planet’s atmosphere there are “gigantic airborne jellyfish monsters”. [1 G] PLANET (2.4°) {9 AU-10 AU}

Enceladus: (0.18x Moons Mass) The closest major moon to Saturn, it is about the mass of Pluto in OTL, and has water-ice geysers. Underneath the ice is a global ocean thought to contain complex life getting energy from Enceladus' internal heating, though its study has so far been limited. The geysers are the source of Saturn's E-Ring, and the moon also has cryo-tectonic plates that resurface the moon. Enceladus' ocean also contains large amounts of ammonia, which also acts as an anti-freeze. It also has a more eccentric orbit around Saturn, heating the moon even more, and making its ice layer relatively thin. [0.06 G] MOON (0°) {9 AU-10 AU}

Titan (Native name Xanadu): (0.06x Earths Mass) The largest moon of Saturn. Discovered in 1655, it is much larger than OTL Titan, which it is very similar to, and has biologically diverse seas of liquid hydrocarbons. Titan orbits where it does in OTL, and has a hazy atmosphere similar to Titan IRL, but at 2 atm at the surface. Titan is also home to various ecosystems including one intelligent species with medieval technology. Titan is large enough to generate its own (weak) magnetic field, like Ganymede in OTL. [0.22 G] MOON (0.3°) {9 AU-10 AU}

Iapetus: (0.02x Moons Mass) One of the few moons that managed to escape Titan, Saturn, and Enceladus' gravitational interactions, Iapetus is the 3rd largest satellite of Saturn, and is the same as in OTL- a large, ellipsoidal, icy moon with a two-tone coloration. [0.02 G]  MOON (15.47°) {9 AU-10 AU}

Uranus: (14.54x Moons Mass) Similar to OTL. An “ice giant” who has an axis tilted sideways (its moons are also tilted to Uranus' equilateral plane.)  

However, Uranus (unlike in OTL) also has a large set of young, (less than 500 Million years old) inner rings composed of both ices and dust (thus much darker than Saturn's rings, but are almost as extensive and massive as Saturn’s' rings in OTL- a 'hidden treasure'). These main rings are located within Miranda's orbit, and are formed by a Miranda-sized Uranian Moon that broke up a two Billion years ago after approaching the Roche limit. These rings have stayed in pace due to the existence and formation of 'Shepherd moons' within the ring system. Uranus also has a system of faint, dusty, outer rings (outside the orbit of Miranda) formed by collisions between objects near Uranus. [0.89 G]  PLANET (15.47°) {18.3 AU-20.1 AU}

Miranda: (0.0009x Moons Mass) Miranda has extreme and varied topography formed by intense geological activity (it looks really cool, go take a look for yourself) and is composed of 75% ice, strangely high. Unlike in OTL, it is geologically active, with cryovolcanoes spewing water ice containing large amounts of ammonia and salts. Its geologic activity is due to tidal interactions with Ariel from its more eccentric orbit (than in OTL). Miranda also has a subsurface ocean containing simple halophies (due to the extreme salt content). It is also the only Uranian Moon that supports life. [0.0044 G]  MOON (4.2°) {18.3 AU-20.1 AU}

Ariel: (0.018x Moons Mass) Similar to in OTL, Ariel is composed of equal parts ices and rocky material, and is crisscrossed with scarps, and canyons due to gravitational interactions with Miranda and tidal heating. It has pockets of ammonia-rich water in its ice layer, similar to pockets of water underneath the ice of Antarctica. These, however, appear to be sterile- one theory is that these lakes were once frozen over, but when Miranda and Ariel went into orbital resonance, these pockets reheated, but devoid of life. [0.0161 G]  MOON (0.3°) {18.3 AU-20.1 AU}

Umbriel: (0.015x Moons Mass) Same as in OTL. Umbriel, like Ariel and Miranda, has canyons, but has an otherwise old surface dominated by craters. It has a very low albedo of 10%, and has a slightly blueish color. Like most of the other major Uranian moons, it is composed of equal parts ice and rock. [0.0142 G]  MOON (0.13°) {18.3 AU-20.1 AU}

Titania: (0.0496x Moons Mass) Same as in OTL. Titania has an extremely thin CO2 Atmosphere, which often freezes into dry ice frost. This is from out-gassing of CO2 from its 50 km thick, ammonia-rich ocean. As this water is located very deep, between its core and mantle, along with the moon's distance, means it is not known if it contains life. This is unlikely, however, as it is likely too cold to allow for earth-like life sustaining processes. It has large rifts and scarps formed by the expansion of its interior during its evolution. [0.0248 G]  MOON (0.34°) {18.3 AU-20.1 AU}

Oberon: (0.04x Moons Mass) Same as OTL. Oberon is a typical Uranian moon, with canyons and rifts (formed by expansion of the planet in its later phases) and is about half ice and rock. It has dark patches similar to marina on the OTL Moon, but formed by cryovolcanic liquids (primarily water) filling the craters, rather than lava. Of course, these liquids quickly froze and evaporated when exposed to the vacuum of space. [0.0332 G]  MOON (0.06°) {18.3 AU-20.1 AU}

Neptune: (17.15x Earths Mass) Same as OTL. An ice giant somewhat larger than Uranus, the deep-blue Neptune has the strongest sustained winds in the solar system (more than even Jupiter). [1.14 G] PLANET (1.78°) {29.8 AU-30.3 AU}

Triton: (0.291x Moons Mass) Neptune's only large moon, Triton is a captured dwarf planet orbiting retrograde to Neptune. It is 2x larger than in OTL, and has a surface covered in frozen nitrogen and methane, and a crust made of water and ammonia ices (which make up 30% of its mass). It has a young surface dotted with nitrogen cryovolcanoes (which can spew plumes up to 8km high), and cut with icy valleys and ridges. Like in OTL, it has ice caps of nitrogen- along with flat, nitrogen-ice plains and “cantaloupe terrain” formed from cryovolcanism.

Triton also has an orbit (but still inclined and retrograde) slightly closer to Neptune- the increased mass of Triton, along with greater tidal heating from a closer orbit means that more of its nitrogen ices have sublimated than in OTL. Therefore, Triton has a much thicker nitrogen atmosphere at a pressure of 57 Pa- 30 x than in OTL (but still very thin- it's about as thin as Mars' in OTL at Olympus Mons). This atmosphere also gives Triton a slight haze, due to its content of hydrocarbons and nitriles in the lower atmosphere, forming from sublimated methane (which also helps heat up the moon).

Triton also has a subsurface ocean holding multiple ecosystems, including multi-celled life- though its biosphere lacks the complexity seen in other moons found closer to the Sun. The first lander sent here, MANN, returned overly optimistic information about Triton and its habitability for life. [0.0582 G] MOON (156.89°) {29.8 AU-30.3 AU}

Pluto: (0.65x Earths Mass) A planet orbiting in a highly eccentric and inclined orbit after being shot out by Neptune/Aether during the formation of the solar system. It has a hazy, thick nitrogen-methane atmosphere (of 3 atm pressure at sea level) from sublimated nitrogen ice, along with methane-based cryovolcanism, thanks to internal and some tidal heating from Charon. Like in OTL, it is extremely contrastive, has an extreme axial tilt of 120°, and has 5 moons- the largest being Charon. However, unlike in OTL, Pluto is not in a binary system, as Charon is much smaller than Pluto.

Pluto's surface is mainly water ice, covered with a layer of methane, including methane seas (like Titan, but deeper, as the Sun does not break apart methane molecules out here) with a variety of landforms. There are also a variety of lifeforms here, centring around underwater cryovolcanic vents (but also lacks significant complexity.) Interestingly, the planet's internal heating is higher than expected, and it was only very recently that the cause was found: An astonishing 0.01% of the planet is made of some kind of radioactive material. The specific elements and isotopes in question don't appear anywhere else in nature other than Charon, suggesting that, in the words of the HAE Space Agency's science director, "sometime within the last 10,000 years, some serious **** went down in the Pluto system."

Pluto was discovered in 1999, as its relatively high infrared signature gave it away to infrared telescopes (despite its insane distance). It was later found to be responsible for the orbits of Sednoids, along as being the explanation for a sudden drop-off in the Kuiper Belt at 48 AU- the Kuiper Cliff- caused by Pluto “clearing its orbit”.

Pluto also has a thin, unstable ring system- thought to be caused by an asteroid-sized moon that got too close to Pluto (this moon was almost certainly a small, captured moon captured much later than Charon's formation.) [0.401 G] PLANET (3°) {101 AU-197 AU}

Charon: (0.7x Moons Mass) The only major moon of Pluto, Charon is about half the size of Titan in OTL. Charon, which formed from a collision on Pluto- has a similar composition as Pluto. Though lifeless, Charon has a strangely young surface dominated by water ice and ammonia (and some hydrocarbons forming an icy inch-thick crust on top of the water ad ammonia ices), along with cryogeysers spewing these ices. As there is a lack of Sun, volatiles do not form reddish tholins here, making it colourless. Like the Moon in OTL, Charon is slowly moving away from Pluto, something that caused the destabilization of the orbits of Pluto's other moons. The volcanism is a complete mystery- it's thought the differentiated Charonian interior (and possibly also Pluto's interior) contains much more radioactive material than originally thought. [0.2 G] MOON (0°) {101 AU-197 AU}

Persephone: (10.0x Earths Mass) Once thought to be the outermost planet in the solar system, Persephone was discovered due to strange observations in the orbits of tiny dwarf planet-like objects around the sun. From the way the orbits are all oriented it was found that a large object was in that part of space. Later observations proved the object’s existence and showed it to be an ice giant like Uranus and Neptune. Persephone’s large size, combined with the discovery of Tyche, lead to the IAU reclassification of what a ‘planet’ was in 2017. [0.31 G] PLANET (30°) {200 AU-805 AU}

Europa: (0.65x Moons Mass) Europa is the closest moon to Persephone, and is very similar to its version in OTL. Europa has a thick water-ice crust, with a liquid water ocean underneath its surface. Its surface is shaped by cryovolcanoes (though smaller than those on Enceladus, they are located at Europa's poles) and 'cryo-plate tectonics'. As a result, Europa has few craters on its surface, and has deposits of salt coating parts of its surface (created when the salty water brought from below rose to the surface during eruptions- similar to lava on Earth.)

However, due to Europa's intensely close orbit to Persephone (which is also somewhat elliptical), it also orbits somewhat faster than its parent planet's rotation. Both these factors lead to greater tidal heating, liquefying its underwater ocean. However, like Triton's retrograde orbit, Europa's super-synchronous orbit dooms the moon to an eventual break-up over Persephone.

This, however, means the moon supports life, even without gravitational resonances providing significant heating. This life is relatively complex, and is clustered around hydrothermic vents and other geological underwater heat sources- though bacteria do live elsewhere in the ocean (along with the underside of the water-ice crust, and in pockets of water inside the crust). Many of these consume hydrogen peroxide, tholins, and other minerals from the surface of Europa. If it wasn’t destined to break apart, it is very likely Europa could be the one place in the solar system whose microbial inhabitants survive the sun’s red giant and planetary nebula phases. [0.134 G] MOON (1.5°) {200 AU-805 AU}

Mimas: (0.042x Ceres Mass) Similar to its version IRL, Mimas is a very heavily cratered moon of Persephone. Mimas is known for its enormous, crater 'Hershel' that makes it look like the Death Star (alas, Kerbals have made numerous proposals to hollow out Mimas into a Death Star- none of which materialized, thankfully). This impact shaped Mimas, and nearly shattered the moon apart. It is also a 'trojan moon' to Europa, and is situated at its trailing L5 Lagrange Point.

It is composed mostly of water ice and, despite sharing an orbit so close to Persephone, has a liquid water ocean only very deep in- and is only home to simple life forms. [0.0065 G] (TROJAN) MOON (1.5°) {200 AU-805 AU}

Tyche: (18.2x Earths Mass) Discovered in 2016 by WISE, Tyche is a large ice giant, known to have a large system of moons and rings. It is also responsible for the orbits of some Sednoids (which had previously been unaccounted for- as Pluto and Persephone alone could not be responsible for their orbits.) Its far distance from the Sun, relatively small size, and lack of seasons (due to its solar distance) means that it lacks much of the winds of most other gas giants- appearing similar to Uranus.

Tyche is in a halo orbit around the Sun, in a near-circular, inclined orbit. Its discovery contributed to the redefinition of what a ‘planet’ was in 2017. Tyche is likely to be the hypothetical “fifth giant planet” responsible for creating the current solar system. [0.92 G] PLANET (83°) {1485 AU-1590 AU} 

Hyperion: (0.0059x Ceres Mass) Hyperion- the same as its version in IRL (other than its different orbit), is a small, irregular moon noted for its sponge-like appearance- which formed due to the moon being very porous and its very low density. Hyperion is darkened due to material from nearby moons, and is somewhat reddish. It is mostly composed of water ice, with very little rock. [0.0021 G] MOON (0.43°) {1485 AU-1590 AU}

Dione: (1.17x Ceres Mass) Dione is an outer, rounded moon of Persephone composed of mostly of water ice (with a small fraction of rock), and is in resonance with Tethys, Hyperion, and Rhea. Being very similar to its version IRL, Rhea and Dione are 'twins', with many of the same features, such as dissimilar leading and trailing hemispheres. However, unlike Rhea, Dione has enormous fractures and ice cliffs dominating its trailing hemisphere, formed by tectonic fracturing in the distant past. It also lacks an internal ocean, unlike its twin moon- though small pockets of heated water are thought to exist in its interior. [0.024 G] MOON (0°) {1485 AU-1590 AU}

Tethys: (0.66x Ceres Mass) Tethys, an outer, rounded moon of Persephone composed mostly of water ice, and is somewhat different from its version in OTL- however, it is much darker than in OTL, due to not being sandblasted by ring particles. Tethys' ice has a large porosity, and is contaminated in many places by compounds like haematites, ammonia, carbon dioxide, and organics. Tethys also lacks the slight discolorations of its OTL counterpart, due to Persephone having a much less powerful magnetosphere, and Tethys' distance from its parent body.

Tethys also is in orbital resonance with Dione and Rhea, and has some chasms and a large impact crater- Odysseus, 2/5s of the moon's diameter. Tethys, despite its resonance, also lacks an internal ocean, like in OTL- though small pockets of heated water are thought to exist in its interior. [0.015 G] MOON (1.12°) {1485 AU-1590 AU}

Rhea: (2.46x Ceres Mass) Rhea, the 2nd largest moon of Persephone, Rhea is similar to its version in OTL. Rhea is an undifferentiated body (ice and rock is spread throughout, therefore lacking a core) with an internal liquid water ocean produced by its gravitational resonance with Tethys and Dione, along with its internal radioactive heating. This liquid water ocean is home to some halophilic bacteria (the internal ocean is very salty) Rhea is a twin moon of Dione, and thus both are similar to each other (for example, both have fractures and ice cliffs). Rhea has a thin exosphere composed of carbon dioxide from oxidation of organics on its surface, which is white, but heavily cratered.

However, Rhea is mainly notable for having a tenuous ring system- the only moon yet known to have a ring system of its own. These particles are 'shepherded' by tiny moonlets that orbit within the ring system, and was formed from an impact 150 million years ago. [0.027 G] MOON (0.35°) {1485 AU-1590 AU}

Fredinnus: (3.4x Earths Mass) Discovered by the decrypting of the Phobos and Deimos Monoliths. A rouge planet on an escape trajectory from Sol, it is currently near its apoapsis to the Sun. It could be a good refuelling stop for interstellar missions, and seems to show that rouge planets are quite common in the Milky Way (estimations range from 2 to 100,000x more rouge planets than stars). Aside from being a frozen-over carbon planet, little else is known about it. All information on this object has been obtained from the monoliths, which have questionable reliability. Fredinnus was the name given to this object by the archiving civilization. [1.67 G] ROUGE PLANET (11°) {Currently 0.9 Ly from the Sun}

Crisplance: (2.1x Jupiter Masses) Discovered by the decrypting of the Phobos and Deimos Monoliths. A rouge planet on an escape trajectory from Sol, it is currently far from its apospsis to the Sun. It could be a good refuelling stop for interstellar missions, and seems to show that rouge planets are quite common in the Milky Way (estimations range from 2 to 100,000x more rouge planets than stars). Aside from being an enormous gas giant, little else is known about it. All information on this object has been obtained from the monoliths, which have questionable reliability. Crisplance was the name given to this object by the archiving civilization. [5.42 G] ROUGE PLANET (5°) {Currently 1.2 Ly from the Sun}

Silverstrivler: (0.75x Earths Mass) Discovered by the decrypting of the Phobos and Deimos Monoliths. A rouge planet on an escape trajectory from Sol, it is currently approaching its apoapsis to the Sun. It could be a good refuelling stop for interstellar missions, and seems to show that rouge planets are quite common in the Milky Way (estimations range from 2 to 100,000x more rouge planets than stars). Aside from being a coreless water-ice planet, little else is known about it. All information on this object has been obtained from the monoliths, which have questionable reliability. Fredinnus was the name given to this object by the archiving civilization. [0.563 G] ROUGE PLANET (8°) {Currently 1.4 Ly from the Sun}

Nibiru System: (0.12 Sol Mass) <Not going to be complete for a while> {Currently 1.02 ly from Sun}

So, with all that said, do you think this solar system is possible? If not, what would I need to change? (Note that it doesn't have to be perfectly stable, just long enough for the alternate timeline to take place)

Edited by ChrisSpace

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I would LOVE to live in a solar system like that, So. Many. Earthlike. Places. Although, I don't know how the physics in such a system would work, maybe someone should make a mod out of it? :)

Also, Pandora is a reference to "Avatar" isn't it?

Edited by Spaceception

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Nibiru would probably destbilise everything. Sorry, get rid of it. Please. For everyone's sake.

Also, Pandora's placement should be closer than Europa for the biosphere to be reasonable. It also should lack advanced life due to excessive radiation levels. A better place for that life would be Venus.

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Having a breathable atmosphere on the moon (unless artificial). That's not possible after billions of years.

Also, may I provide a suggestion? Perhaps the humans in this history, later on after colonizing some planets, realize that planets aren't very good places to live and then build large orbital colonies for more space, using both colony types and reaping their benefits.

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I would LOVE to live in a solar system like that, So. Many. Earthlike. Places.

Having places that are already habitable was my solution to the problem of running space colonies with 19th-century technology. It also makes colonization much cheaper and more tempting.

I don't know how the physics in such a system would work, maybe someone should make a mod out of it?

That was basically my question, also I like the mod idea.

Also, Pandora is a reference to "Avatar" isn't it?

Sorry, I couldn't come up with any original cool-sounding name. Suggestions are welcome.

Nibiru would probably destbilise everything. Sorry, get rid of it. Please. For everyone's sake.

How about I just move it really far out so it never comes near the rest of the solar system?

Also, Pandora's placement should be closer than Europa for the biosphere to be reasonable. It also should lack advanced life due to excessive radiation levels. A better place for that life would be Venus.

So, swap the positions of Europa and Pandora, and swap the biospheres of Venus and Pandora? Well, I wanted Pandora's biosphere to live on a world slightly warmer than Earth, so that makes one thing easier. Also, couldn't a powerful magnetic field around Pandora negate the 'excessive radiation levels'?

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You should ask a modmaker who has experience making star packs to make it into a mod, and what did you mean by "Alternate history project" anyway? And instead of "Pandora" How about "Jakku" in honor of "The force awakens" :)

Edited by Spaceception

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9 minutes ago, ChrisSpace said:

 

 

Having places that are already habitable was my solution to the problem of running space colonies with 19th-century technology. It also makes colonization much cheaper and more tempting.

 

 

That was basically my question, also I like the mod idea.

 

 

Sorry, I couldn't come up with any original cool-sounding name. Suggestions are welcome.

 

 

How about I just move it really far out so it never comes near the rest of the solar system?

 

 

So, swap the positions of Europa and Pandora, and swap the biospheres of Venus and Pandora? Well, I wanted Pandora's biosphere to live on a world slightly warmer than Earth, so that makes one thing easier. Also, couldn't a powerful magnetic field around Pandora negate the 'excessive radiation levels'?

Well, Pandora should be closer to Jupiter than Europa in OTL. It would also need to be as big as Earth to generate a lot more heat and magnetospheric shielding from Jupiter's belt. That would probably sling both Europa and Io out (Io actually would make radiation worse, as it spews high energy particles itself. Don't take my word, though, I'm not an expert.

 

Nibiru is a dumb idea anyways, but a better idea would be to just make it a brown dwarf flying by the Sun via the Oort Cloud. We have no idea how being in a binary would affect the solar system.

 

How about "Laythe" as a name? :D

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Earth's Moon is already pushing definitions of a Moon in a lot of ways. For Luna to have breathable air, it would have to be a planet, making Earth-Luna system a double planet system without any doubt. (I still insist that we should be classifying Earth-Moon system as a double planet.)

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You should ask a modmaker who has experience making star packs to make it into a mod

I might do that once I have fully sorted out what this solar system is going to be like.

And instead of "Pandora" How about "Jakku" in honor of "The force awakens"

Sure, sounds cool.

Well, Pandora should be closer to Jupiter than Europa in OTL. It would also need to be as big as Earth to generate a lot more heat and magnetospheric shielding from Jupiter's belt.

So, swap out Io for Pandora/Jakku and move Europa further out?

Nibiru is a dumb idea anyways, but a better idea would be to just make it a brown dwarf flying by the Sun via the Oort Cloud

My original reasoning behind Nibiru was that it could be a 'half-way point' between interplanetary and interstellar travel, and that it could also be the only non-Earth place in the solar system where a spacefaring species develops.

How about "Laythe" as a name?

Not sure if i'll go with Laythe or Jakku.

For Luna to have breathable air, it would have to be a planet, making Earth-Luna system a double planet system without any doubt.

Not necessarily. If it's iron core were bigger it could generate a magnetic field that would be strong enough to stop the solar wind from blowing away the atmosphere.

 

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I am not convinced that the once-a-month rotation of Luna is enough to create a dynamo. Especially on an object so relatively light.

 

EDIT: Also, I vote for Laythe. :D

Edited by Findthepin1

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Having a system with so many habitable planets\moons all over it (even in places absolutely not conductive for it realistically) just begs to place artifacts of ultra-advanced civilisation in some places. A big "Made by Magratheans" sign written across the hemisphere of one of the planets perhaps? :D

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With so many habitable places, it sort of gets a bit... boring? What I'm trying to say is that life seems a lot less rare and special, which makes it less interesting in a way. Everything else is very interesting though. Just one thing, how will they be able to get to space with 19th century technology? Are you assuming that in this timeline, useable rockets were invented earlier?

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Just one thing, how will they be able to get to space with 19th century technology? Are you assuming that in this timeline, useable rockets were invented earlier?

It is based roughly on this: http://forum.kerbalspaceprogram.com/index.php?/topic/115752-a-world-building-guide-to-steampunk-space-travel-please-add-your-thoughts/

And trust me, the life on these new worlds is going to be far from boring. (Also I didn't have much of a choice as its the only way the solar system can be colonized)

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4 hours ago, ChrisSpace said:

Not necessarily. If it's iron core were bigger it could generate a magnetic field that would be strong enough to stop the solar wind from blowing away the atmosphere.

Got nothing to do with magnetosphere. Moon's escape velocity is 2.4km/s. Given the mean temperature this distance from the Sun, a sizable fraction of Moon's atmosphere will have escape velocity at any given time. You need at least 5km/s, which is the size of Mars, to have a chance to keep atmosphere this close to the Sun. So your Luna would have to be size of Mars at least, putting barycenter FAR above Earth. The Luna and Earth would orbit a common center, rather than Luna orbiting Earth. You'd have a Dual Planet situation. There is no way to avoid it if you want it to have breathable air.

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Got nothing to do with magnetosphere. Moon's escape velocity is 2.4km/s. Given the mean temperature this distance from the Sun, a sizable fraction of Moon's atmosphere will have escape velocity at any given time. You need at least 5km/s, which is the size of Mars, to have a chance to keep atmosphere this close to the Sun. So your Luna would have to be size of Mars at least, putting barycenter FAR above Earth. The Luna and Earth would orbit a common center, rather than Luna orbiting Earth. You'd have a Dual Planet situation. There is no way to avoid it if you want it to have breathable air.

I was actually thinking that the breathability of the atmosphere is only temporary. In that case it should still last for many centuries.

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For "many centuries", it will last even on our Moon. It will constantly be cooling, of course, thanks to atmo evaporating away, so it won't be nearly as warm as on Earth. In fact, it will be downright cold. But hey, if you plan to dump enough atmo on the Moon-like object to make a breathable atmosphere, realism went out the window long ago. You probably will insist that it's being heated as well. At these kind of energy expenditures, I don't know why you're even asking about realism of that system. Just maintain orbits with large rockets.

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For "many centuries", it will last even on our Moon. It will constantly be cooling, of course, thanks to atmo evaporating away, so it won't be nearly as warm as on Earth. In fact, it will be downright cold. But hey, if you plan to dump enough atmo on the Moon-like object to make a breathable atmosphere, realism went out the window long ago. You probably will insist that it's being heated as well. At these kind of energy expenditures, I don't know why you're even asking about realism of that system. Just maintain orbits with large rockets.

Well for this project I need something to be habitable at about one moon-distance from Earth, so what do you think I can do?

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Are you just trying to see how many times I can say "double planet" in one thread?

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Well, to be fair a Mars-sized, habitable body at Moons distance would turn all the other colonisable bodies OP wants in his system redundant. Such "companion" would take centuries if not longer to become saturated with humans to the point of turning rest of the system desirable for colonisation again.

Hence my proposition of making this system blatantly artificial. Such setting would allow for Moon-sized body with breathable atmosphere, strong magnetic field and even 24-hour long day - just place hiperadvanced gravity generators at the core. They even could be powered by artificial singularity (or floobie dust :P) It would take current inhabitants centuries, if not millenia of exploration and research just to understand how such machines work - thus preserving the 19 century-esque, Steampunk setting.

Edited by Scotius

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I cansolve the problem, replace the moons iron silicate core with lead, this will raise the specific gravity. in the center you can have high atomic number metalics in an iron core that generates a magnetic field, lead being fairly soft will melt. Are we fairly far from reality land yet, the moon of course would be cooler, so we just spray paint it black and then add water. done, problem fixed.  Oh, by the way doing this we made the bay of fundy tides now catastrophic, hmm, gps system does not work anymore, lets see, but tidal energy is now competitive with all other renewables. 

 

Now why is it exactly that we want an orbiting celestial with the surface properties of earth that has 1/20th the surface area (guessin) when 90% of the earth remains largely unoccupied?

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1 hour ago, PB666 said:

1/20th the surface area (guessin)

Suspiciously accurate for "guessin".

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Regarding the planetary "alignments": Give pictures of some sort, that's quite hard to be imagined.

For planet sizes vs surface gravity : Have you noticed that density of a body is fairly related to it's size ? I'll find some figures (or calculations) of smallest body size possible where one g can be achieved (probably pushing the trend a bit).

 

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2 hours ago, K^2 said:

Suspiciously accurate for "guessin".

sorry

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10 hours ago, ChrisSpace said:

 

 

I might do that once I have fully sorted out what this solar system is going to be like.

 

 

Sure, sounds cool.

 

 

So, swap out Io for Pandora/Jakku and move Europa further out?

 

 

My original reasoning behind Nibiru was that it could be a 'half-way point' between interplanetary and interstellar travel, and that it could also be the only non-Earth place in the solar system where a spacefaring species develops.

 

 

Not sure if i'll go with Laythe or Jakku.

 

 

Not necessarily. If it's iron core were bigger it could generate a magnetic field that would be strong enough to stop the solar wind from blowing away the atmosphere.

 

No, Io is too close. Laythe would be in between Io and Europa IRL.

5 hours ago, PB666 said:

I cansolve the problem, replace the moons iron silicate core with lead, this will raise the specific gravity. in the center you can have high atomic number metalics in an iron core that generates a magnetic field, lead being fairly soft will melt. Are we fairly far from reality land yet, the moon of course would be cooler, so we just spray paint it black and then add water. done, problem fixed.  Oh, by the way doing this we made the bay of fundy tides now catastrophic, hmm, gps system does not work anymore, lets see, but tidal energy is now competitive with all other renewables. 

 

Now why is it exactly that we want an orbiting celestial with the surface properties of earth that has 1/20th the surface area (guessin) when 90% of the earth remains largely unoccupied?

No, the composition of the planets (and Gas giant cores) is roughly uniform (with the exception of Mercury, probably due to having its mantle torn apart). Luna would be a binary to Earth, which is something that is uncommon in Solar Systems- which makes a configuration like this unlikely.

6 hours ago, ChrisSpace said:

 

 

Well for this project I need something to be habitable at about one moon-distance from Earth, so what do you think I can do?

Make the moon-Earth a double system, and make the rest of the Solar system less teeming with life?

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