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Has the moon ever collided with the earth

 
 
Reply Sun 4 Apr, 2010 03:31 pm
Has the moon ever collided with earth
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Type: Question • Score: 3 • Views: 1,822 • Replies: 10
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djjd62
 
  1  
Reply Sun 4 Apr, 2010 03:41 pm
@Jase Crooks,
yeah, just last week, it was on all the news channels, how did you miss it
0 Replies
 
Robert Gentel
 
  2  
Reply Sun 4 Apr, 2010 03:45 pm
@Jase Crooks,
The currently favored theory for the origin of the moon is the giant impact hypothesis which posits that the moon was created due to such a collision with earth.
farmerman
 
  2  
Reply Sun 4 Apr, 2010 04:46 pm
@Robert Gentel,
There is evidence that rocks on a side of the moon are more acidic, hence they seem to be including some crustal material from a source not the moon itself.
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rosborne979
 
  1  
Reply Sun 4 Apr, 2010 06:29 pm
@Jase Crooks,
Jase Crooks wrote:

Has the moon ever collided with earth

No.
0 Replies
 
Ionus
 
  1  
Reply Sun 4 Apr, 2010 10:53 pm
No. But it regularly collides with lovers, according to Dean Martin.

When the moon hits your eyes,
like a big pizza pie,
thats amore...

The origin theory was a proto earth collided with another body and the current earth and moon were formed from the collision. I dont buy it. I think the moon was a foreign body in a very similar orbit rather than a crossing orbit and it was captured far closer than it is now, tearing and heating up the surface of both.
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g day
 
  1  
Reply Mon 20 Dec, 2010 05:05 pm
@Jase Crooks,

Apparently the only capture scenario that works for an Earth / Moon binary system at our distance from the Sun, mass, orbital velocity is a glancing collison with a Mars size planetoid, that melts our crust, transfers over half the mass of the object to Earth, and leaves a debris cloud - like Saturns rings - of the other half, which eventually congeals under gravity to form the Moon we so know and love. I believe pretty exhaustive modelling has ruled out every other alternative and the Earth and Moon show high simalarity in rocks, but the Moon lacks abundance of heavier elements - which under the collsion model would have been deposited on our planet.
roger
 
  1  
Reply Mon 20 Dec, 2010 09:19 pm
@g day,
From that, can I conclude they don't collide very often?
g day
 
  1  
Reply Wed 22 Dec, 2010 06:35 pm
@roger,

Once so far - and it was a total fender bender.

Unlike artifical satellites- which generally slow down as they hit space dust and hydrogen atoms and over very long periods eventually fall to Earth, the Moon is recessing - and is moving away from Earth a few centimetres each year (measurable and checked by lasers on a daily basis) - the average Earth / Moon distance is growing.

Played backwards of course this means during the ages of the dinosaurs the Moon would have been much, much closer to Earth!
roger
 
  1  
Reply Wed 22 Dec, 2010 07:21 pm
@g day,
I heard about that. If it recedes too far, we are going to miss the best part of the solar eclipse.
0 Replies
 
Setanta
 
  1  
Reply Thu 23 Dec, 2010 05:43 am
@g day,
I knew a teenaged kid in the 1980s who, when he learned about this, became genuinely alarmed. I had a hard time convincing him that he wouldn't live to see the day . . .
0 Replies
 
 

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