Honestly, I don't like sounding like one of those 5 yr olds fantasizing about aliens, but thinking that we are the only planet with a form of life, its almost ignorant.
There's got to be some kind of life out on other planets like earth.
I doubt there's life on mars, or at least no intelligent life maybe bacteria, and such.
As far as aliens on other planets there most likely are other civilizations considering how large the universe is.
Most likely a mix of uncivilized, and civilized planets inhabit it.