What are the chances that in our lifetimes we will see>fossils of vertebrates on Mars>bizarre sea creatures living on Titan
If life was brought to Sol via asteroids, it's possible, but low.If life arose independently on Gaea, then next to zero.The first scenario has a next to zero chance if being true.The question we should focus on rather than "is there other life out there?", is "how can we survive out there?".