IMHO, life in the galaxy should be very common. I would guess that most F, G and K class stars within the galaxy's habitable zone had, have or will have planets bearing life. However I suspect the only life bearing planet in our Solar System is the Earth.

Johannes said the following:

"I wonder why so many people insist that life can not exist anywhere except Earth."

I mention this with considerable repugnance:

There are religious fundamentalists who take it as a matter of blind faith (dogma) that the Earth is the only world in the universe with life on it.

I am clueless how the religious funamentalists justify this through any rational biblical argument. Such a view is certainly not justifiable by any sort of rational scientific argument. However it is probably wrong to assume these people are entirely rational.

Gary