I believe that there is other life out there. I mean, they found single cell organisms on asteroids that came from outer space, and they found water/ice on other planets, so isn't it plausible to say that there can be other life? It's foolish to say that we're the only ones here, because there could be much older life forms out there, considering the earth is a bit young.
And it's possible for life to exist anywhere where the necessary chemical reactions can take place.
Life doesn't have to evolve under earth-like conditions. Silicon based life could evolve on a planet that is 200 degrees F at its coolest. Who knows!