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Old 03-21-2012, 01:01 AM
 
Location: Capital Hill
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This is fantastic:
APOD: 2012 March 20 - Evolution of the Moon
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Old 03-21-2012, 01:34 AM
 
Location: Nantahala National Forest, NC
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Thanks for the great link!
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Old 03-28-2012, 06:36 PM
 
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Quote:
Originally Posted by Vinylly View Post
So was the moon formed by accretion as similar to the earth or was it blasted out of the earth from a cataclysmic collision as the film clip didn't mention that?
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Old 03-28-2012, 07:56 PM
 
Location: Texas
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It seems to me both the Moon and Earth would have both been hit multiple times.
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Old 03-28-2012, 07:57 PM
 
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Quote:
Originally Posted by Brian.Pearson View Post
It seems to me both the Moon and Earth would have both been hit multiple times.
They were. Multiple millions of times.

But in all likelihood, only once by a Mars sized object.
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Old 03-28-2012, 08:08 PM
 
Location: Texas
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Quote:
Originally Posted by DentalFloss View Post
They were. Multiple millions of times.

But in all likelihood, only once by a Mars sized object.
So is it thought that either the Earth or Moon would have been hit by a Mars-sized object?
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Old 03-28-2012, 08:20 PM
 
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Quote:
Originally Posted by Brian.Pearson View Post
So is it thought that either the Earth or Moon would have been hit by a Mars-sized object?
I believe the theory (which isn't just a blind theory, it fits the data) is that roughly 4.5 billion years ago, the earth and the moon were one body, and that early earth was struck by a mars sized object which caused the ejection from the ancient earth of the material that coalesced to become the moon. Prior to that collision, there was no moon.
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Old 03-28-2012, 08:27 PM
 
Location: Texas
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Quote:
Originally Posted by DentalFloss View Post
I believe the theory (which isn't just a blind theory, it fits the data) is that roughly 4.5 billion years ago, the earth and the moon were one body, and that early earth was struck by a mars sized object which caused the ejection from the ancient earth of the material that coalesced to become the moon. Prior to that collision, there was no moon.
It's amazing how circular the orbit is. Unfortunately, we'll eventually lose the Moon. I wonder how that will effect things.
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Old 03-28-2012, 08:40 PM
 
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Originally Posted by Brian.Pearson View Post
It's amazing how circular the orbit is. Unfortunately, we'll eventually lose the Moon. I wonder how that will effect things.
I don't think we'll be here to see it.
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Old 03-29-2012, 12:37 PM
 
Location: Texas
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I tell my wife I'm getting younger. Hypothetically speaking, the tides would eventually cease to exist.
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