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||[-] Read Andy Weir's "The Martian" (2011) or Robert
"The Moon Is A Harsh Mistress" (1966) to get a sense of how
important that shit is for survival away from Earth. It's too
valuable to just fling it randomly around.
||-Edit to add: I'm not sure what
you mean by "random re-rentry." If you're pitching it
towards Earth, it's gonna burn up in the atmosphere. If
you're putting it in lunar orbit, it's not gonna "re-enter"
anything - no atmosphere to re-enter or to cause the orbit
decay. If it eventually spirals in anyhow, it's just gonna
back on the lunar surface and likely vaporize on impact.
||He's envisioning it orbiting the moon in a degrading orbit
that eventually see's it hit the surface, presumably as part
of some long term moon terraforming project.
||I think it's more likely to have its orbit perturbed by the
earth each pass until it eventually breaks orbit & slingshots
off into the great black yonder or gets captured by the
earth's gravity & achieves reentry to the wrong object
||But I'm no physicist & can't be bothered to work out the
||Admittedly that's mostly because I wouldn't know how to.