The technology to deflect that rock is a lot closer than the technology to make Mars livable. And whatever technology we get to make Mars livable can be used to make (keep) Earth livable.
(I’m still a strong proponent of going to Mars, and someday colonizing it. And also, going to the stars, even though it means sending a generation ship.)
The technology to deflect that rock is a lot closer than the technology to make Mars livable. And whatever technology we get to make Mars livable can be used to make (keep) Earth livable.
(I’m still a strong proponent of going to Mars, and someday colonizing it. And also, going to the stars, even though it means sending a generation ship.)