Panspermia is a perfectly reasonable hypotheses, albeit a bit out there right now:while I believe in evolution of living things... there is no science showing that life evolved from non life here on earth.
so it would be funny if random chance said... lets evolve that non life into life... but leave no evidence or path of how we did it so that some scientists in the early 21st century would still be speculating life must have been deposited on the earth from somewhere else.
I actually think that the truth may be even more far out. Craig Venter hints at it here:
http://www.amazon.com/Life-Speed-Li...8&qid=1392942275&sr=8-1&keywords=craig+venter
You can actually send out the genome out into space as a light beam. So you can send out just the genome of a single celled life form, then see how it evolves on that particular planet. If so, there are living forms all over the Universe that looks similar to us. There was a really interesting STNG about this:
<iframe width="640" height="390" src="//www.youtube.com/embed/NbHGYlB7208" frameborder="0" allowfullscreen></iframe>