Let's just say we were able to terra-form Venus in a short time period. I understand that it does matter how to the answer, but for the question we’ll leave how to the responder, so how might Venus’ geology be different from that of Earth’s? I understand there is a theory that Earth was very much like Venus is today before a comet almost the size of Mars hit us. If Earth were changed at a earlier time and Venus were changed now how might that span of time modify the outcome of geology on the two planets?