Well, I think it's logical to believe that there is a possibity that other "creatures" do exist outside this planet. But studies have proved that none of these other galaxies or planets are habitable like earth. So if any being were to survive in any other galaxy, they would have to have special survival equipment. And again, you could start the argument, that what if the creatures are comfortable in their invironment just like we humans are comfortable on earth? Well, Let's just say, it hasn't been proven.
huh? they have proof that EVERY SINGLE galaxy(of which there are billions, if not more than that) is void of planets with life on them? and besides, that's not true. they have discovered a planet with the possibility of sustaining life. it's 20 light-years away in a solar system much smaller than ours with a group of planets surrounding a red dwarf star. but urrent technologies won't allow scientists to study the planet's atmosphere for chemical signs of life. here's a quote from the article-
'A new member in a family of planets circling a red dwarf star 20 light-years away has just been found. It's called Gliese 581g, and the 'g' may very well stand for Goldilocks.
Gliese 581g is the first world discovered beyond Earth that's the right size and location for life.
"Personally, given the ubiquity and propensity of life to flourish wherever it can, I would say that the chances for life on this planet are 100 percent. I have almost no doubt about it," Steven Vogt, professor of astronomy and astrophysics at University of California Santa Cruz, told Discovery News.'
so to answer to your question yes i think there is life out there. in fact the likelihood of earth being the only planet that can sustain multi-cell life is practically zero. have they made contact with us? i find that extremely unlikely.
oh, here's the article...
http://news.discovery.com/space/earth-like-planet-life.html