tomf

If it is a small boat electric outboards exist https://www.google.com/search?q=electric+outboard+motor&oq=electric+oub&aqs=chrome.1.69i57j0i10i433j0i10j0i10i457j0i10.8277j0j7&client=ms-android-oneplus&sourceid=chrome-mobile&ie=UTF-8#scso=_zowHYaD6N5XD8gKcmrTwBg7:0

Or use the kerbal method of releasing the cargo stationary , then translating the launching vessel out of the way. Ok that isn't the real kerbal method, the real kerbal method is releasing the cargo then time warping until it drifts out through the walls.

This graph shows the theoretical tides on a planet with two moons in a 3/2 resonance with periods of 20 and 30 days https://www.desmos.com/calculator/qa050dsx5t The red line is the influence of the inner moon with a 20 day period, the blue is the outer noon (30 day peiod period, 4/9 the effect strength) and the green is the sun (x is in days) the purple is the sum of the effects of all three. As you can see the interval between high and low tides pretty much follows the strongest signal, but the spring neap cycle is more complicated.

Our tides are pretty much the sum of two sine waves, one with a period of a day from earth's rotation relative to the sun, and the other of slightly longer period due to the earth's rotation relative to the moon. You do get high tides on both the side near the moon and furthest from it so the new moon is basically equivalent to the full moon. When these are in phase withe the earth moon sun forming a straight line (either way round) they add and you get big Spring tides, when they are at 90 degrees they are out if phase and you get smaller neap tides. The moon sine wave has bigger amplitude so the highs and lows follow the moon's cycle of of 25 hours or so. With two moons you are going to be adding three waves. The biggest tides will indeed come when everything is in a straight line. The smallest tides will probably come when smaller moon and sun are at 90 degrees from the bigger moon. Jupiter seems to manage well with its moons in a 4:2:1 resonance so your moons could be something like that. Actual tides are more complicated and depend on coastline shape and ocean basin shape as well as the astronomy.

What are the little badges top right of the avatar? The shield appears to mark moderators but I've seen a hand too. What others exist and what do they mean?

What spaceX should do is bring it a Mars colonization simulator called Oregon Mars trail. At each synodic period you get to send more colonists and material to Mars, sign colonist priorities and contend with various incidents. In 100 years time you get points depending on how many colonists you have, how miserable they are and how much you spent on the colony.

Pretty much everything bigger than a cm is tracked on radar but for smaller objects you have to rely on shielding and the size of space. I expect missions leaving Leo don't spend any time in place where debris is thickest. Perhaps a few orbits low where debris will have decayed away quickly and then away.

My parcel contains an alien camping power generator. "Just feed a litre† into the reservoir of this handy 2kg acme fusion generator and the p-p fusion will generate enough energy to power your acme anti-gravity mattress for the whole night"* † units translated to earth units *real alien campers think this is cheating

But it does in theory exist? Edit: I only mentioned alcubierre because that is why I believe negative mass is theoretically possible.

Alcubierre dive plans rely on negative mass don't they? Could you generate lots of negative mass and drop it into your black hole?

It's a little hard to see, but it isn't what you would normally term a hohmann transfer. That is normally used to travel between two bodies in orbit around the same third body e.g. mun and minmus or kerbin and Duna. It also has the characteristic that the pe is exact at the orbit of the inner body and the ap is at the orbit of the outer body.

I assume the regenerative cooling is enough to take the heat away from the bells where the rs-68s ablative cooling wasn't enough. Raptors were designed to be used in clusters after all.

There is the ISO standard for dates and times https://en.m.wikipedia.org/wiki/ISO_8601 The problem with time is that the units that are most important to people on earth, years and days, aren't constant, aren't nice multiples of each other Are only relevant on one tiny blue spec in the universe. Any attempt to make something so inherently messy make sense is always going to fail somewhere.

The person responding played it well "I'm not going to call you an idiot in this public meeting, instead when I have thought of a polite way to explain it I will email the explanation to you"

I think people who think spaceX is primarily about money are underestimating Musk's ambition. He is already rich, but he wants to be the man who Saves Mankind. In his mind Tesla will save mankind from global warming Space X will save mankind from asteroid strike etc. The ai company will save mankind from a rogue ai scenario. He was going to be the man to save the Thai boys. Even the boring company is supposed to save mankind from the tyranny of traffic. In most men this would be a Messiah delusion bordering on mental illness but through luck and skill Musk has got to a position where he has to be taken seriously.

Wikipedia does have some stuff about using neutron bombardment to reduce nuclear waste https://en.m.wikipedia.org/wiki/Nuclear_transmutation

Airfix appear to have made lots https://www.ebay.co.uk/b/Airfix-Rockets-Space-Models/1189/bn_37573175

It's going to depend on the temperature, close in to a bright star with a strong wind it is going to be hard to hold on to anything

Looking at the video I can't believe that is the most efficient air swimming stroke. I would have thought something like breast stroke would be best. I have also had to do some experiments in blowing. I reckon I can blow 5l (I have unusually large lungs) through a 4.5mm diameter straw in 3.5 seconds for a velocity of 90 m/s¶ and 0.5 kgm/s momentum. I could do that about once every 10 second without getting to dizzy giving me an acceleration of 0.0006m/s^2 The intake is going to be pretty directionless so should have minimum momentum. ¶ 90m/s is about double what an internet search suggests is an upper bound.

I think the usual plan has it being lowered down from geostationary orbit. If you keep the centre of mass at the right height then it will remain stationary relative to earth's surface. Because it isn't moving you can just continue down into the atmosphere until you got the ground, no re-entry heating or anything. There well be problems with the cable having angular momentum, spinning but those will have to be solved well before it is long enough to get to the atmosphere.

Contracts have been awarded to build a reactor in space to revive nuclear propulsion. https://spacenews.com/general-atomics-wins-darpa-contract-to-design-nuclear-reactor-to-power-missions-to-the-moon/

I don't care how clever and good your sheilding material is. Nothing short of magic is blocking the radiation in this scenario https://what-if.xkcd.com/73/

Ian M Bank's Algebraist has portals that only work in flat areas of spacetime so any nearby mass, e.g. a planet causes the portal to explode. That leads to ships being used to get around inside a system and get to and from the portals which are in distant orbits. It isn't very compatible with portal based fuel transfer though.

One of the mission objectives for the Mars Reconnaissance Orbiter is to provide hish speed data relay for rovers on the surface of mars, which technically aren't satellites themselves are close enough.

I'm afraid I don't have time to look after this mod any more so I am going to leave it in the more than capable hands of @linuxgurugamer Thank you to everyone who has downloaded it over the years.