Could Extraterrestrial Life Exist in Unique Environments Like Titan?

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While people have been speculating about life from other solar systems there is the possibility that there may be extra terrestrial life in our own back yard. Europa has a very good chance of harbouring some sort of primitive bacterial life similar to those found round undersea volcanic vents on Earth.
 
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not to mention Titan, etc.

These environments are enough different from Earth that
detailed investigation of their (bio/organic) chemistry
might test the "anthropic" expectations that many seem to have.

I just hope our investigation doesn't contaminate these worlds
before we can accomplish the necessary studies.