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Comment Mach 3.5 catapult launcher (Score 1) 642

4300 km/h is my first rough guess of the needed Moon-relative launch velocity to kill the Earth-relative orbital velocity that the Moon naturally grants the projectile.

Given the mass requirements of high velocity atmospheric-entry I suspect that's a pretty big launcher needed.

Comment Depends on the ambient pressure (Score 2) 48

Planets start forming as cold dust with all the water-ice evenly distributed in 3D. Pressure builds progressively as the temperature also rises. The water, by enlarge, stays trapped throughout as a liquid - only slowly escaping to the surface. If the surface is too cold then it'll freeze again as it rises.

I predict The Moon, like The Earth, will have plenty of water below deck.

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