oHere is something I have thought about for while so I will offer my 2 cents, the solar system makes trip around the Galaxy about every 220 million years, and they say the first primitive life arouse around 3.8 billion years, so what if, during that time either we were seeded by some type of life from an asteroid or we seeded some other planet elsewhere in the galaxy? It would seem on the surface that it would be highly improbably but we never really have had any decent tests for life elsewhere not even Mars, the tests for life on Mars are basically a joke and were subject to budgetary constraints. When we finally go and test and image extra solar planets we will be able to come up with better theories, the theories about life are only as good as the information fed into them and I think they are subject to change. I do however think the theory of comments carrying water Earth and being responsible for most of our oceans is a bit improbable.
Source(s):
http://www.coasttocoastam.com/
http://www.nasa.gov/
http://planetquest.jpl.nasa.gov/

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