Green Baron

*sigh* Since this won't go on without a sacrifice, here you go (Hint ? What hint ?) :-)

During the Krakatau eruption and landslide on the 22. that caused a tsunami in Indonesia with >400 hundred people dead, the Anak Krakatau lost approx 2km² of area and 200m of height, as observed by Japanese earth observation satellite Alos-2. https://www.eorc.jaxa.jp/ALOS-2/en/img_up/dis_pal2_eruption_anak_krakatau_20181226.htm

Nasa has an event calender: https://www.nasa.gov/nasalive The time is estimated to 05:33 UTC.

It does not rotate (or only very slowly) or its pole is pointed towards New Horizons ?

Nobody doubts that but pls. try to understand: in many cases only one makes sense. Only one makes sense. Simple example: When you are calculating normals (for texturing, movement, lighting, ...), you can use only 1 of them (usually the positive) or you get a normal in the wrong direction which messes things up. The sign does matter as you say, but irl only one (usually) makes real sense.

Depends on the use case. If that is the case we can use the |x| operator. In geometry for example a minus usually makes no sense. Or, when computing matrices and vectors for graphics stuff then minus make no sense, we don't look at that case. Theroretically, yep. Imagine the possibilities :-) Man, again, it is -2kg. If you don't like apples, take oranges :-)

How much sense make -2 apples, a duration of -2 seconds or a distance of -2 centimeters ? Only the speed in the term may be negative (moving the other direction then) but it does not matter because it is squared.

Yeah, that would have reminded us too much of Zephram Cochraine (sorry for any misspelling), wouldn't it ?

Well, how much sense make -2 (very fast) apples ?

So SpaceX is really planning to build (part of) the hull of the Starship of steel ? Or is this just for the grashopper and further material decisions must yet be felled ? I mean, high-alloy steels can have fantastic properties if treated correctly, they can be incredibly hard, or very temperature and pressure resistant (am thinking of cooling circuits in power plants, large turbine elements and rests), keeping their strength even at 500/600°C. But they are also very dense, which would cost a lot of payload capacity when used as main construction material for a rocket hull. Anyway, few materials can withstand reentry heat. I can imagine that boiling of fuel for "ablative" cooling (taking the heat away) is more inefficient than an ablative shell, which can be made lightweight. One thing for sure, it does look nice ;-)

Welcome, @Patrick C, to the forum :-) Besides all the other valuable info, mods like Kerbinside offer launch sites at different places. Well, not at 50.000ft amsl because such a mountain does not exist. Get the game and try it out. You will not regret it :-) - you can launch horizontally with a space plane. Which is somewhat advanced. - math and physics: a good place to start is the wiki. Academic math and physics, well, an archaeologist can play it ... - mass fraction of payload is higher than irl. It is hard to give numbers, but ... 10% ? When you are through with the wiki and things like the rocket equation you will calculate the abilities of your designs on your own or use mods to display the numbers while you build. To start: dive into calculation of dV (Delta-V), the ability of a rocket to change its speed by a certain amount of m/s. To reach a low orbit outside of Kerbin's atmosphere you need ~3.3km/s (if i recall that right ...). For a real world earth that'll be around 8km/s. If you don't mess up the ascent too much, that is. Hope i don't get to big a correction now :-)

What ? This bridge ? Jamas ! (Never) ... oh, that bridge ... :-) And just a few years later (Swiss federation):

Launches: 1.) InSight 2.) BepiColombo 3.) Parker Solar Probe Because science. Not sure about Chang'e 4 and the dozens other Chinese launches' relevance yet, Falcon Heavy was surely thrilling (glad it went well) but must step behind science missions on my top 3 list :-) Mission highlights: 1.) Osiris/Rex (nevermind spelling pls.) arrives at Bennu 2.) Hayabusa 2 arrives at Ryugu 3.) New Horizon just woke up and stretched its limbs, though the real highlight will be early next year ... I am sure i forgot something due to my ignorance of not keeping track. These are just the ones on my mind.

Welcome to Rivendell, Mr. Anderson !

Exactly. It is the box that is accelerated because it stands on some surface on the earth. Relative to earth you just oscillate a bit. Relative to the box you will accelerate infinitely to just below the speed the of light in an infinite time (neglecting all weight, friction, heating, whatever, so scifi/gaming stuff :-)). IRL, equally as you are accelerated towards the earth the earth is accelerated towards you. Fortunately, there is no way to transport a body in a gravitational field from a to b in no time and so cheat the counter reaction ;-).

Diogenes 2.0: Well, it didn't happen in my life but not far from here. Frenchman Jean-Jaques Savin took on sea from El Hierrro for an Atlantic crossing ... in a barrel. He'll be drifting at around 1-2 nots. If i was him, i'd reserve half of the barrel for ... well, whatever he would need to kill the time. https://www.france24.com/en/20181226-france-savin-frenchman-sail-sailor-boat-atlantic-barrel-sea. And as Plato once said about Diogenes: "A mad philosopher" (or so) i am tempted to say "A mad sailor". Expect barrel rolls.

Looks like a special case of Fermat's theorem, but my math knowledge is limited to what i need to successfully go shopping

Train pic:

ikr ? The blanket is no moderator, nor a "fission style" heat exchanger.

Yes. Made from matchsticks and glued with white glue. Problem: when it is heated, it falls apart. That is why they are researching a different glue. Estimations are that by 2025 such miraculous stuff may be available. Fusion needs no moderator, there is no danger of a runaway reaction. Here, kinetic energy is converted into heat. A heat exchanger has a different working principle, it transfers heat from one medium to another via contact surfaces. So there may be an exchanger at a later stage, to separate the fluid from the blanket from the one that may drive a turbine. I would expect such a separation for safety reasons, so that a leak at a turbine stage does not affect the plasma stage. But i am sure there is more info on how they plan to produce electrical energy on the web site.

You're welcome :-)

This. It shall convert the neutrons' kinetic energy into heat for power generation. Suitable materials are yet to be tested, if i understand them correctly.

Factorio ? But needs an own server setup if you don't want to join an existing one. It is in terms of possibilities one of the deepest games i know, besides production chains (and fights which you can switch off) there's transport logistics, trains, combinatoric logic ... No, everybody is on their own computers, sorry.