[David Maes]

I also believe we're not alone in the universe; but the distances are overwhelmingly large.
I also think panspermia is possible.

There are already discovered lifeforms here in vulcanic lakes etc., they can survive great differences in temperature and the impact when the asteroid is hitting the earth; so it could be possible they could have infiltrated on our planet by asteroids for example.

Some lifeforms deep in the ground don't breath oxygen, they breathe iron. They are extremely primitive.

They could be the origin of our existence.