Wickramasinghe, an astrobiologist at Cardiff University, believes the first "seeds of life" were deposited on Earth 3,800 million years ago. He said life through the universe was transferred from planet to planet over billions of years as comets hit them and pushed matter into space.ooh, a two-list pinger. Thanks Free ThinkerNY.
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COSMIC ANCESTRY
Life comes from space because life comes from life
http://www.panspermia.org/index.htm
There is no sort of alien origin theory for our own biosphere which does anything at all for evolution(ism). The simplest one-celled animals in the universe are still vastly more complex than anything man has ever built, they still could no more evolve on Mars, anything orbitting Alpha Centauri or anything else than they could here, and all that any such theory does is kick the can down the road a couple of blocks.