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For a discussion's sake (about our moon)
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It has been proven that are moon is slowly moving away from our planet. Think of it like this when you spin something around in a circle 1) it gets harder and harder to keep it in your hand the faster you go (i've proven this many times in calculations and experiment plus its common knowledge!) 2)also if you were to let it go, it would keep moving in that direction until gravity pulls it down and it drops! The moon is no different. It is spinning using gravitational centripetal force. However these forces are not enough to keep the moon at its current position! It has been speculated that a few million (50 or so...) years ago the moon would have taken up 1/4 of our night sky! [kinda frightening] I'm not sure when but eventually we will lose our moon! t_t
Anime rox ç§ã¯pro =D
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Re: For a discussion's sake (about our moon)
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on 2007-02-07 10:50:03 |
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your physics is completely and utterly wrong, but it is none the less true the moon's orbit is receding away from the earth. this has nothing to do with spinning faster and faster. the rotational velocity of the earth is in fact slowing, due to loss of momentum by the "sloshing" of the ocean. i wont patronize other users with BASIC NEWTONIAN PHYSICS but djowtlaw, you really should look into it! gravity and centripetal force are TOTALLY different things. the one and only reason for the recession of the moon is that it's orbit is receding. this is not due to letting go or spinning around or any hogwash of the sort. instead, it is due to the arbitrary fact that billions of years ago, when it was formed, the net momentum of all the little pieces of stuff that combined to form the moon gave it a nearly perfect orbit, allowing it to escape the earth's gravitational pull, albeit relatively slowly. of course, no orbit is perfect, and after 100 billion years no planet or moon in existence now will be recognizable. See also: http://www.talkorigins.org/faqs/moonrec.html 
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