Re:The effects of 3 suns (Score 1)

Yes, good point. Because of a previous slashdot article, I'm rereading the foundation series of Asimov. At this moment, I'm reading "Foundation and Earth", and there is a lot to do about the importance of earth having a large moon, but some things are unclear to me (from the book):

• is a large moon very rare?
• is a large moon a prerequisite for biological evolution and intelligent life?
• are there other influences of having a moon, apart from the ones mentioned above?

I'd really like to know, so if there are any astronomists out there...