And if you think so, what kinds do you expect?
Scientists look for earth-like planets but that doesn't mean they're only looking for earth-like life. We know that there are many different varieties of life, even on earth (some life on earth doesn't require oxygen and we have even discovered whole communities of life that can survive without heat and energy from the sun) and scientists take all this into account in their search for life. There are some promising ideas about what kind of life could be out there and where it could be. Moons like Titan and Europa still hold the promise of life and we have also discovered many extra-solar planets that could harbor life as well. Unfortunately we still don't have a single example to point to . However, we have already learned quite a bit exploring the space that we have explored (the lesson from the Voyager mission is to expect the unexpected) and I remain hopeful that we will eventually find some kind of life out there (hopefully not in the form of a giant assimilating cube ).I personally beileve that life/aliens do exist in space. And that scientists that look at the "neccesities of life" but are only looking at what we here on earth need. It is how we adapted to the conditions on earth millions of years ago. Who isnt to say there are other life forms that can survive one no oxygen, maybe they have adapted to live on carbon dioxide, or even other types of gas found in space. Along with the idea, why we think we are the only intelligent life, humans have only been around for a few million years. And the universe itself is billions. Then the whole coming to earth thing, if we can fly to the moon and have people walk on it, why cant other life exist and want to accomplish that same feat?