Hi Keith. It is certainly possible, although we can't prove it yet. Astronomers are discovering more and more stars with planets around them. We have yet to discover life on another planet, though, evan one in our own solar system. People are working on ways that they might detect life or at least conditions that might be good for life on planets around other stars. Some information about the search for "extra-solar" planets is here:
http://www.planetary.org/...e/topics/extrasolar/
Cheers, Terry