No, I don't believe in that. I think it's impossible to find life on any planet rather than the Earth. Life can't exist without enough water. Even if there's another standards of living that we still don't know, living beings can't live without food and water. Of course, they wouldn't eat space dust! Aliens are just science fiction. In movies, they embody aliens close to human or animals' structures. If there were any creature that's similar to the Earth's creatures, it would follow the same rules and standards.