My point about 'time' seems to have been lost...
Sorry for the repetition, I'll keep it brief
Time From A Fly
From a fly's point of view, humans are very slow, large creatures which live for hundreds of generations.
Time from an Elephant
From an elephants point of view, humans are small and very fast moving creatures with a relativly short life.
BOTH.
How does the elephant see the fly and vice versa?
It's fair to say, the elephant can 'see' the fly, butthe fly cannot 'see' the elephant. The elephants movememnts are so slow, the fly may well not notice them!
So, who's to say that alien life isn't microscopic and it's been here, looked around and gone again billions of times over with nothing more to discover?
If we are talking about alien life as being *ANY* life, then yes, I would imagin there are countless lifeforms on countless planets.
If however we are talking about the kind of life form we cound communicate with, which percieves time at the same rate as us.... then that, I believe, would indicate there may be no other life in the universe