Artemis II

argyle said:
The dark side of the moons is a myth. There is a far side of the moon which we don't see because the moon is tidally locked to the Earth so one side is always facing us.

That side of the moon gets just as much sunlight.

You're right that there are seemingly pockets of water ice though in craters or bases of mountain ranges that shield the ground from the sun.

So every part of the moon has the same light on it? There is one part that gets less light

If mankind ever have bases there then long term there are ideas to use and reuse this water.
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dickie davies said:
Why do satellites stay in orbit then instead of crashing back down to earth?
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Because they are going so fast, orbit velocity is something like 17,000mph. To achieve orbit velocity they work out beforehand how long to fire the rocket versus the mass and thrust that is available. When a satellite comes to the end of its life they deorbit it by firing its thrusters to slow it down and then it drops like a stone.

Satellites or anything else in orbit are constantly falling towards Earth but also constantly moving away so they never quite get away or come back. There is no air resistance or any other force except gravity in space so it stays like that until something changes.

If Earth's gravity was just 5-10% stronger then chances are we'd be stuck here and getting into orbit at all would be basically impossible. If it was meanwhile however 5-10% weaker then it'd be very easy.
 
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