I hope that their is life out there, and ^ i wish i lived in the ST universe, cause i am a huge nerd, but really, its a better time, more hopeful, peaceful, idealistic, etc. Anyways, back to the topic at hand, i believe aliens exist, though, i think they would follow something similar to the prime directive, and not communicate w/ us, only observe, but jeb the alien sometimes forgets to activate the cloaking device...-_-. My rambling isnt making much sense is it..
Still though, i think aliens probably figured a way around the laws of physics that we know. But, then again, maybe not...