[jmcenanly]

With the resources of an entire solar system at their disposal, why would they bother with a dried up rock like this one? There are more resources in the asteroid and Oort belts than on Earth. Even Jupiter's moon Europa has more water than Earth.

It would make more sense for them to simply build habitats than to try to terraform a planet

[MHGinTN]

Weapons to fend off aliens? If aliens wanted to terminate the human race and God would let them do it, there are sufficient astroids in our solr system to end human dominance in one day. Presume that aliens advanced enough to travel here from another star system can move space rocks around at will, and no weaponry we can develop int he next thirty years is going to match the hail of rocks the aliens can send our way. And as a hint: mutually assured destruction isn’t a credible threat we could make in the next hundred years, probably. we haven’t even found a non-terrestrial life source yet!