Originally Posted by
Xei
We don't have enough evidence to say for sure. We do know, however, that almost as soon as water condensed on Earth, life began; which shows that it may be a likehood with the correct conditions. We also know that there at least 10,000,000,000,000,000,000,000 stars, which basically means that even if the probability of life starting was relatively small (which, as I just mentioned, it isn't anyway), the probability of there being lots of life in the universe would still basically be 1.
The strongest form of evidence would be if we actually found some life. There are a few places in the solar system where it might exist.