We'd have to be very conceited to believe that we're the only beings in this vast universe. Scientists are discovering new planets all the time. Maybe whatever's out there is searching for us as well.
Oh, I don't think they're little grey or green men either.
i believe that there could be life on other planets, anything is possible on that subject. i mean there could be a planet that sustains similar conditions to that of Earth. it's not impossible that it could in turn be able to sustain life as well.
sometimes i think the aliens look over at our planet like we're the stupid and annoying friend in the group and are just like "oh my god, the Earthlings are trying to contact us again. just ignore them, maybe they'll go away."