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PostPosted: Mon Nov 26, 2007 11:54 am 
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Joined: Wed May 02, 2007 8:30 pm
Posts: 371
Location: Barnsley, England
Finding science related news stories for display boards at school, I found this story about the Moon being a rare thing on the BBC.

My question for debate is this: Last time I read anything into the start of life, the Moon and the tides that it causes were considered to be pretty important. So does the fact that a nice 'round' moon is a rare thing affect the formation of life in the Universe as I would expect? Do we have to start relying on our fictional planets having captured asteroids so that we can explain life?

Jo Thomas

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PostPosted: Mon Nov 26, 2007 12:51 pm 

Joined: Mon Feb 26, 2007 3:11 pm
Posts: 2122
Location: Cheshire, UK
Not sure we know but moons are common in the solar system so you might have earthlike moons rather than earthlike planets and you would get tides, maybe big tides.

Also tides might help life 'colonise' the land areas but life evolving in any seas should still be possible.

Storms and weather might replace tides to some extent so life might still move from sea to land but via rivers or storm surges and maybe it would take a billion years longer to do so.

We have 'flying fish' and given the aeons maybe they would evolve into birdlike creatures and move onto the land. Evolution is a powerful force for change.

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PostPosted: Fri Nov 30, 2007 11:49 am 
A planet with a moon or moons is more stable in terms of rotation, orbit etc than one without - that's what may have helped life. I don't think anybody believes a moon is a prerequisite for life though.

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