...there is life on other planets?

Almost certainly (and I only include the "almost" out of due deference to tentativity)

Now, how much of this life has developed into something more complex than a basic microbial stage is another question entirely...

Basic reasoning for the above (off the top of my head):

Abiogenesis is a physical process and thus we can assign a gross probability, p, to the probability that abiogenesis occurs in a single trial.

The number of trials appropriate to p is roughly the number of stellar systems to +/- an order of magnitude or so.

Let us consider just the Observable Universe. That gives an n of around 10

^{22}. Let X be the number of abiogenetic events.

If p>10

^{-22}, then E(X)>1 and P(X=1) is very small.

If p~10

^{-22}, then E(X)~1, but still P(X>1) > P(X=1), and suggests a level of "fine-tuning" which would require further explanation.

If P<10

^{-22}, then E(X)~0 and P(X=1)>>P(X>1), but P(X=1)<<1 and thus X=1 is a highly significant event which requires further explanation.

*Edited by cavediver, : No reason given.*