We might never know. Space is never-ending and with all the planets there is bound to be life. But we might never find them with how big space is. And by the way IF we did they wouldn't be like green and a weird voice. That's just from the movies
Scientists did fact that on mars and europa were two galaxy places where living things can and was found. Mars had water and water was one of the goldilocks condition where living things live because we need liwuid water for living things to survive and to this day, europa is covered in ice and ice can form without water so the viking and nasa went to europa ( jupiters moon) and is still digging in ice sheets to look for water and hopefully living organisms,
Please see my comment to animalcareer's answer. While the search for extraterrestrial intelligence (SETI) continues under the hope that there might be other life in the Universe, none has yet been found. And BTW, I'm an astronomer.
I think there had to be other life because we have never been out side our solar system. We haven't even gone outside our galaxy an there are billions of other galaxies and trillions of other solar systems. The univers is just too big for us to be the only life in entire universe
Of course there is lol. How is it that were the only living things w/ intellagant life in this galaxy...and I heard they already found another galaxy, and in that galaxy there was a planet, that they indicated had almost the perfectt temperature for life.... So just thinkk of all the possibilites