Read this article if you have time, it is interesting to think about and tie together some of the things we have been discussing:
http://www.astrobio.net/debate/2168/launching-the-alien-debates
"...Let's say we go to Titan, and we find life that has had a separate creation, with no communication with Earth-like life ever. That's not just a separate phylum, kingdom, domain, or dominion, it's a separate tree. As taxonomists, we have to be ready to build a bigger house. Because it's coming -- either we'll find it or we're going to build it, but there will be life as we don't know it in a diversity of form on this planet in this next century. It's being built in many places right now." (Peter Ward)
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