Bc u guys are pretending not to know that everything we are doing to destroy earth could terraform mars. Thankfully an inviolable astronomical honor code not only preserves the native conditions of another planet, it prevents countries from having a destructive proxy war on the planet to try to invasively experiment and “reform” it to their own ends. Anyway, space junk in the Earth’s orbit was also a very dangerous problem. The explosive substrate starting w/a p or something on the surface of Mars that activates in contact w oxygen or something could make things difficult if I recall correctly. Giant 3d spaceprinters are sweet. There is also the largest known cloud of water vapor floating Out there diamond planets and more inhabitable moons etc