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Posted by Alexander on December 18, 2001 03:51:10 UTC

There should be plenty of civilizations in space, as it contains plenty of stars - about 10^21 in the visible part of universe alone.

Our Milky Way has about 10^11 stars, and it seems that most stars have planetary systems.

Q: Given such abundance of planets of all kind, what do you think about how common should be life in universe and in our galaxy?

How common/rare should be primitive life (pre-cell)? How common is more complex (multicell) organisms? Brain-posessing life (animal-like)? Intelligent life?

Can we assume that primitive life can be abundant? (So, the more complex, the more rare?) Can life forms be way more complex than humans?

Do you think that we have no visitors mainly due to impossibility to technologically overcome speed of light limit and impossibility to "warp" space? Or nobody simply knows of our existence? Or nobody is interested to visit "mediocre" civilisation of us?

Do you think that there are no SETI signals due to too large distances between civilisations which makes power of transmitter unreal? Or communication is pointless due to lack of dynamics (1000s years of wait time if distance between civilizations is 1000s of light years).

Could civilisations be closer to each other in star clusters and in Milky Way center, where stars are only few light-days away?

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