Without constant supplies from the earth, no other colony can even survive. You can't settle a world with life because its microbes would be deadly to you. You'd need to terraform a planet and there are no suitable candidates nearby. A colony on mars would never be self-sufficient and would die out soon without supplies from the earth.

If an asteroid hits and kills us all, then that is it. Nothing we can do about it. At most, we could build a space station above the earth that's somewhat self-sufficient. All life would certainly not go extinct. Earth has been hit by giant asteroids, blanketed under ice, and bathed in volcanic waste in the past.

Life has always returned. It's just that the old life forms died out. New ones took their place. That is the law of nature. Dinosaurs ruled the earth for tens of millions of years. Only bones remain of them now. Their last descendants are the birds and the Rhino. The same will happen to man and all the other species on earth one day.

To accept this truth is to be truly traditionalist. To argue otherwise and think that you can rise above natural laws is the essence of modernity and Judaism.