are we alone in the universe? are there any conclusive evidence of their presence in the universe?
85115
no but aliens won't look like the ones in movies and they have even found past microscopic life on mars.
281970
it's a hard question to answer, cuz same as you can't be certain aliens don't exist, you really can't know for sure if they do !! Although I can't say they exist ... i don't really see it impossible ... they "might" exist ;)
22092
How can we be alone?\n6,487,053,332 humans moving on the planet (http://www.census.gov/main/www/popclock.html) and u say we are alone!!!\nJokes apart... there is enough probability for life to exist in the universe.... if we are existing here... then there can be some other organism existing elsewhere...\n\nDefinitely there is life elsewhere... only problem... it'll take time to find them out...
761703
I believe, because there is no way we are the only "intelligent" beings in the universe! Are we that vain to think we are alone? If Star Trek could really happen, sign me up on the next USS Enterprise headed out!!
1003114
Our solar system is not the only solar system in the universe.  There are hundreds and thousands and millions of other planets in the universe, and many are just like ours, but we don't know about them because we have never been able to get anything further than pluto to get a good specific picture of stuff.  In a general picture, though, we do know there are other galaxies in the universe
1127356
greetings....\n\ni actually believe that we are not alone...i have my own encounters... the universe is big....so big we cannot even start to comprehend how big it is... chances are, life could actually be abundant in the universe, but the degree of intelligence could vary widely, maybe life exist only in microbial form, or with intelligence much superior than ours... but for now only earth is known to harbor life... aren't we lucky we are here?
429563
There is no way for us to know since we are defined by our own universe.  There does not need to be a substance outside of our universe for it to expand.  A substance would slow us down.\n\nThe most popular theories for what lies beyond our universe are nothing (nothing to us anyway, it would be nothing of this universe so we certainly wouldn't recognize it), and other universes.  But explaining multiple universes gets complex and it's hard to decide if they are more like bubbles or like russian matryoshka dolls.
176957
it's a hard question to answer, cuz same as you can't be certain they don't exist, you really can't know for sure if they do !! Although I can't say they exist ... i don't really see it impossible ... they "might" exist ;)
34650
Yeah I think you babble...\n\nThere is no proof that we have been visited, but there are people like Eric Von Daniken who offer proof.\n\nThe most compelling theory is Drake's equation, which shows that given the number of star systems, it is almost beyond comprehension that there isn't intelligent life out there.
236672
it's a hard question to answer, cuz same as you can't be certain they don't, you really can't know for sure if they do !! Although I can't say they exist ... i don't really see it impossible ... they "might" exist ;)
98138
Yes, it'd be foolish to think we are the only one's in the universe.
1137921
If there was just nothing, we would never know what could happen because we wouldnt exist.\nI believe there is more out there in the universe than what we know of.\nWether we discover these things or not is hard to ever say.
182660
There has to be, the universe is way to inmense for us to be the only ones in existence.
362363
There is, sadly, no evidence of aliens.  I'd love to encounter visitors from another planet (of the peaceful variety, at least, I'm not looking forward to a real-life game of Space Invaders!), but there don't seem to be any.  Maybe we all smell funny.\n\nThe evidence against the so-called alien encounter stories is pretty telling.  Look up "spleep paralysis" for an explanation that covers the "alien abductions".\n\nBut, while I don't beleive earth is being visited, that doesn't mean I believe it isn't happening, just that the people who say they are meeting aliens seem to be wrong.  If aliens are here, they're being very quiet, observing us like biologists behind blinds.\n\nLife seems pretty easy to develop in the right circumstances.  I expect the universe will be full of life, though most of it will be of the bacterial level of complexity, getting no further.  I would be surprised if there weren't other intelligences out there somewhere, though.  It just doesn't seem that difficult to evolve.  Still, I don't know and I won't pretend I do.  Here's hoping!\n\nAs my father says, either there's life out there or there isn't.  Either way, it's amazing.
1128124
considering all the illegal immigration talk lately of course i believe in aliens...ok, crappy joke aside...\n\nits rather conceited for humans to think that in the huge vastness of time and space that there is us and only us...i'm rather on the fence as to whether there are or aren't aliens in the universe, its a question that will only be explained when technology can accurately answer it and not a moment sooner...unless of course little green men suddenly start landing here asking to speak to our leaders...
1151168
The laws of probability makes it a yes to your question.  We are not alone.  In fact earth is just a speck in our own galaxy.  Our galaxy is just one of many galaxies.  Yes it would be amazing to find other beings....provided they were friendly...LOL
376906
All of them.....otherwise, how would we knowvthat they exist?