I don't think it's out of the realm of possibilities, especially when you see how many suns there are just in our universe alone, imagine the billions more throughout the infinity of space... it seems impossible that life would only exist on this small speck among all of that.
However, since we are such a small outpost in such a huge ocean of stars, an intelligent life form may have a hard time even finding us. Of course if that life form has evolved way beyond our current state of technology, space travel may not be such a difficult issue as we think it is.
I just read that travel to Mars for humans currently would cause cancer in the astronauts who are making that trip because of exposure to radiation which penetrates the spacecraft during the travel. We can't figure out how with our current technology to prevent that. Our astronauts would die after the trip.
But there may be some very evolved life out there. That was a cool aspect of Ridley Scott's film Prometheus.
Last edited by getken (2013-07-01 21:18:20)