With all those discussions why not put your energy into practice? There is only one way to find out..Join SETI@Home (
http://setiathome.berkeley.edu/)
We don't know how big our universe is, but one thing we are certain is that univserse is huugggee. It contains trillions and trillions of stars and one of them must have a planet that could have condition that could support life and I have a feeling that we are not alone.