I think that it would be unwise of us not to believe that there is life outside of us, intelligent life. And so I do believe in aliens.

I believe that there may be intelligent life on other planets.

I think space exploration is very important. I think there is very intelligent life on Mars. I believe that Martians are spying on us from the bottom of the ocean.

I believe alien life is quite common in the universe, although intelligent life is less so. Some say it has yet to appear on planet Earth.

I believe life is an intelligent thing: that things aren't random.

If this is the only planet on which not only life, but intelligent life, has arisen, that would be very unusual.