There shouldn't be any craters! A "Terraformed" planet has geological cycles that cover up hits from meteors. Earth has been hit plenty of times, but we don't see craters from space.
- Those geological effects are principally driven by tectonics, which Mars does not and will never again have, regardless of how much water and atmospheric gas might be dumped onto the surface. There's also the fact that we don't know how quickly this hypothetical terraforming occured. Assuming it was accomplished on a humanesque timescale (mere hundreds or thousands of years), craters would continue to persist for a significant length of geologic-scale time before being obscured by "natural" processes. — Preceding unsigned comment added by 173.21.57.231 (talk) 01:36, 30 January 2013 (UTC)
