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Old 01-29-2019, 01:32 PM
 
Location: Seattle
2,396 posts, read 506,465 times
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https://phys.org/news/2019-01-moon-r...uts-earth.html

That's actually pretty cool. A pristine sample of early Earth can be a scientific boon. If we found one purely by chance, odds are there are many more available. We may find samples from various time periods uncontaminated by subsequent chemistry or biological processes. That could tell us a lot about the history of the Earth.
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Old 01-30-2019, 02:02 PM
 
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I am not surprised that part of earth is found on the moon since the earth-moon system was formed when a protoplanet collided with the early earth and each body absorbed the other's materials. However, their guess of how the earth rock ended up on the moon is logical:

Quote:
However, a simpler explanation is that this piece was formed on the Earth and brought to the surface of the moon as a meteorite generated by an asteroid hitting Earth about four billion years ago, and throwing material into space and to the moon.
I am thankful that the moon is there to protect us from so many things.
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Old 01-30-2019, 02:11 PM
Status: "living in a political world, where mercy walks the plank" (set 16 days ago)
 
Location: Bel Air, California
21,745 posts, read 22,548,111 times
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it could have been carried there by a Swallow
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Old 01-31-2019, 11:57 AM
 
Location: Seattle
2,396 posts, read 506,465 times
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Quote:
Originally Posted by davidt1 View Post
I am not surprised that part of earth is found on the moon since the earth-moon system was formed when a protoplanet collided with the early earth and each body absorbed the other's materials.

Err, no. The initially-formed Moon was likely fully molten.
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Old 01-31-2019, 12:12 PM
 
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Quote:
Originally Posted by rjshae View Post
Err, no. The initially-formed Moon was likely fully molten.
My understanding is the moon formed out of the debris field that coalesced after the collision. This debris field has materials from both earth and the protoplanet. This is what I meant when I said the moon has earth materials in it. Of course the heat and pressure would have combined everything into the moon.

What are you objecting to? Please explain.
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Old 01-31-2019, 05:14 PM
 
Location: Seattle
2,396 posts, read 506,465 times
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Quote:
Originally Posted by davidt1 View Post
My understanding is the moon formed out of the debris field that coalesced after the collision. This debris field has materials from both earth and the protoplanet. This is what I meant when I said the moon has earth materials in it. Of course the heat and pressure would have combined everything into the moon.

What are you objecting to? Please explain.

If the collective debris was fully molten for presumably a lengthy period, an individual rock would be unlikely to survive. I would think the sample most likely came later. But we'll see.
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Old 01-31-2019, 10:08 PM
 
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Quote:
Originally Posted by rjshae View Post
Err, no. The initially-formed Moon was likely fully molten.
Actually, it is likely that the initial state of the material that eventually formed the Moon was so hot, and ionized that it was a plasma cloud, as was much of the earth after the impact.
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Old 01-31-2019, 10:11 PM
 
3,426 posts, read 2,791,710 times
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Quote:
Originally Posted by rjshae View Post
If the collective debris was fully molten for presumably a lengthy period, an individual rock would be unlikely to survive. I would think the sample most likely came later. But we'll see.
That sample we collected is only about 4 billion years old, which means it likely landed on the Moon after being ejected from Earth during the late heavy bombardment. Recall that at that time, the Moon was much closer to Earth than it is today.
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Old 02-04-2019, 07:43 PM
 
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Quote:
Originally Posted by Ghengis View Post
it could have been carried there by a Swallow
African or European?
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Old 02-10-2019, 04:32 PM
 
Location: 912 feet above sea level
2,270 posts, read 936,140 times
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Quote:
Originally Posted by Ghengis View Post
it could have been carried there by a Swallow
"Tranquility Base here. The Swallow has landed."
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