I came here to say this. If Earth gets struck by a large object we might be glad (i) we have another planet and (ii) we have a way to survive on an otherwise un

I came here to say this. If Earth gets struck by a large object we might be glad (i) we have another planet and (ii) we have a way to survive on an otherwise uninhabitable planet that Earth has become. In fact living on mars might be the perfect preparation for what Earth might be like after climate change in a few hundred years time. The technology generated by colonising Mars might help with climate change.