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Old 07-16-2019, 12:21 AM   #1
Siliconaut
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Default Does anyone know how far the moon was from Earth when it was created?

So I've been doing a lot of selenography type observations and starting to understand the moon on a pretty deep level through the eyepiece. But one question I can't seem to find is if anyone has ever calculated just how far the moon was from Earth at the time it came together from the orbital debris left behind by the Earth/Thea impact event.

I know the moon formed pretty close but I've never been able to find actual distance from which the moon started. So if anyone has some knowledge they can upload it would be appreciated.
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Old 07-16-2019, 03:43 AM   #2
Linguofreak
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Quote:
Originally Posted by Siliconaut View Post
 So I've been doing a lot of selenography type observations and starting to understand the moon on a pretty deep level through the eyepiece. But one question I can't seem to find is if anyone has ever calculated just how far the moon was from Earth at the time it came together from the orbital debris left behind by the Earth/Thea impact event.

I know the moon formed pretty close but I've never been able to find actual distance from which the moon started. So if anyone has some knowledge they can upload it would be appreciated.
I'm not sure:

A) That we have a clear enough picture of what the impact scenario actually looked like to really have an answer to that question. Indeed, while the giant impact hypothesis is currently the favored hypothesis for the formation of the moon, it has not been conclusively proven.
B) That the question is actually will defined even for a particular model. When does the largest chunk of debris begin to count as "the moon"? Depending on definitions, the answer to "how far" may be "in contact".
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Old 07-16-2019, 07:05 AM   #3
GLS
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It had to be further out than the Roche radius.
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