There are millions of millions of planets out there, it is impossibile to believe and against all odds that no forms of life exist on any of them.
Nothing is impossible, don't you know? Certainly it is possible. Sorry, but this line of reasoning belongs to what I call the religion of the 10 monkeys. That is, the "theory" that if you put ten monkeys in a room with ten typewriters, eventually they would, by random chance, recreate every novel ever written. After all there are only so many different ways you can combine the finite letters of the aiphabet, so, given enough years, centuries, millenia, wouldn't it be IMPOSSIBLE NOT to?
This is the religion of scientism. Just make the number big enough. If millions of years or planets doesn't do it, make it billions, or trillions. At some point the number will be big enough to be impressive.
If God has created life in other places, what is it to us? And if He hasn't, who are we to say that such a thing is impossible?
Hey, maybe, just maybe WE are the "first" race intended to populate the universe, to be who other races will eventually wonder about when they finally think about "how did we get here"?
Or how about the possibility, due to those REALLY BIG NUMBERS that we are throwing around here, that the chance that we and any other sentient race that might exist might actually bump into each other is really pretty small to the point it makes winning a lottery you didn't even enter likely?
So, I don't think it is impossible at all. God knows.
Reminds me of The Hitchhiker's Guide to the Galaxy which states that in an "infinite" Universe, we know that the number of planets that might actually be inhabited will be a finite number. And if you divide infinity by any finite number, no matter how big, the probability that you would actually meet is so incredibly small that you might as well assumme that anyone you actually DO meet is simply a figment of your imagination....