To each his own but I don't see anything remarkable about the concept of "seeds of
life" blowing around in space. The universe is extremely old and there have been count-
less millions of novas and supernovas that could spread a planet's biosphere from one
end of the universe to the other. Anytime a planet that's about ready to support life passes
through this material it simply becomes "seeded" like an enormous petrie dish.
People imagine that the earth is a closed system but in all probability there's not really
such a thing as a closed system.