Panspermia / Exogenesis (Score 2, Interesting)

This was an interesting article, but it neglected to address the idea that life on earth may have been seeded from outside the planet. It is possible that life on our planet is the result of panspermia. This throws into doubt any conclusions about a Great Filter, and may also invalidate the idea that life appearing on Mars is bad news for us (humans), since if life here may have been the result of panspermia, then so too would life on Mars likely have occurred for the same reasons. An even more far-out hypothesis is that life on our planet is itself the result of alien efforts to seed life on other worlds (a sort of biological von Neumann probe).