Could mercury be the body that smashed into the earth and helped create the moon?

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Profile Bob DeWoody
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Message 1920284 - Posted: 21 Feb 2018, 19:57:24 UTC

On a recent episode of "How the Universe Works" the subject was Mercury and what has been discovered since the recent Messenger probe sent there. It has been discovered that most of Mercury's mantle is missing and it was determined that it was due to a massive collision early in the history of the solar system. Since it has also been theorised that our moon was formed after a fairly large planetoid collided with the earth I am wondering if it is possible that Mercury was the culprit,
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Message 1920461 - Posted: 22 Feb 2018, 17:24:01 UTC
Last modified: 22 Feb 2018, 17:26:05 UTC

It doesn't seem too likely that Theia, the name given the impacting planet that is thought to have struck the Earth and created the Moon, can be identified as Mercury. Recent work on the nearly identical oxygen isotopes of Earth and Moon seem to indicate a head-on collision.

Theia was presumably destroyed at that time, its material incorporated into the primordial Earth, and Moon. Also-- Earth is said to have a larger than expected iron core, for planet of its size. This, too, suggests that the core of Theia was absorbed by Earth.

Please find a link, below, to an article with more details on the recent scientific work on the Giant Impact Hypothesis:

http://newsroom.ucla.edu/releases/moon-was-produced-by-a-head-on-collision-between-earth-and-a-forming-planet
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Message 1920581 - Posted: 23 Feb 2018, 1:49:08 UTC
Last modified: 23 Feb 2018, 2:19:03 UTC

Or perhaps both air and water for that of the Earth, if not any sand, dust, or stone, for that of both the Moon and also Mars.

For one thing still both hemoglobine which could be making up your blood, if not any iron which could be making up much of a planet, and here Mercury.

Still four small planets innermost in the solar system, and next the four gas giants as well, and the solar system is far from smooth or homogeneous, when it comes to both composition and structure.

Like a bit of sunshine when also having the oceans of Earth, also the bit of strange surface for that of Mercury, including its visible color.

If one thing is still the fact that the planets could be orbiting the sun, next no such thing as any hype or speculation for that of making it the man in the Moon either.

One of Saturn's moons is having a giant impact crater on its surface, but such a thing apparently does not affect much of other things.

https://en.wikipedia.org/wiki/Tethys_(moon)

Here perhaps easy to miss the whole fact, but here it possibly happened, and made for a bit of surprise.
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Profile Wiggo "Socialist"
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Message 1921836 - Posted: 1 Mar 2018, 5:53:25 UTC

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Profile Bob DeWoody
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Message 1922282 - Posted: 3 Mar 2018, 2:51:33 UTC - in response to Message 1921836.  

Just goes to show how little is really known about the early history of our solar system.
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Message 1922445 - Posted: 3 Mar 2018, 15:22:20 UTC - in response to Message 1922282.  

Just goes to show how little is really known about the early history of our solar system.

Yes. But this happened more than 4 billion years ago.
Now there is two theories to explain the origin of our moon that make sense,
Our moon was created by a hit of another "planet".
Our moon was created by giving birth from Earth.
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Message 1922471 - Posted: 3 Mar 2018, 17:18:57 UTC

The prevailing hypothesis is that the Earth–Moon system formed as a result of the impact of a Mars-sized body (named Theia) with the proto-Earth (giant impact), that blasted material into orbit about the Earth that then accreted to form the present Earth-Moon system. The far side of the Moon has a crust that is 30 mi (48 km) thicker than the near side of the Moon. This is thought to be due to the Moon having been amalgamated from two different bodies.

This hypothesis, although not perfect, perhaps best explains the evidence.
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Message 1922483 - Posted: 3 Mar 2018, 18:16:33 UTC

I am well aware of the prevailing theories. It just seems to me that it is possible, however remotely, that Mercury might be the the object, that is referred to as Theia. Especially after reading of the discoveries that were made by the instruments on the Messenger probe. It is claimed that the mantle and crust of Mercury are missing, leaving the exposed core.
Bob DeWoody

My motto: Never do today what you can put off until tomorrow as it may not be required. This no longer applies in light of current events.
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Message 1922496 - Posted: 3 Mar 2018, 18:59:25 UTC - in response to Message 1922471.  
Last modified: 3 Mar 2018, 19:01:36 UTC

This hypothesis, although not perfect, perhaps best explains the evidence

Yes. But that theory doesn't rule out other theories .

And as Bob DeWoody points out.
Where is the crust that once was on Mercury now?
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Message 1922671 - Posted: 4 Mar 2018, 6:18:26 UTC

MESSENGER's radio tracking has allowed the scientific team to develop the first precise model of Mercury's gravity field which, when combined with topographic data and the planet's spin state, sheds light on the planet's internal structure, the thickness of its crust, the size and state of its core, and its tectonic and thermal history.

Mercury's core is different from any other planetary core in the Solar System. Earth has a metallic, liquid outer core sitting above a solid inner core. Mercury appears to have a solid silicate crust and mantle overlying a solid, iron sulfide outer core layer, a deeper liquid core layer, and possibly a solid inner core. These results have implications for how Mercury's magnetic field is generated and for understanding how the planet evolved thermally.

https://www.nasa.gov/mission_pages/messenger/media/PressConf20120321.html
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Message 1922715 - Posted: 4 Mar 2018, 15:06:51 UTC

Maybe the mission BepiColombo will answer some more questions.
https://en.wikipedia.org/wiki/BepiColombo
The main objectives of the mission are:[2][10]
Study the origin and evolution of a planet close to its parent star
Study Mercury as a planet—its form, interior, structure, geology, composition and craters
Investigate Mercury's exosphere, composition and dynamics, including generation and disappearance
Study Mercury's magnetised envelope (magnetosphere) - structure and dynamics
Investigate the origin of Mercury's magnetic field
Verify Einstein's theory of general relativity by measuring the parameters gamma and beta of the parameterized post-Newtonian formalism with high accuracy.[11]

The planned mission schedule is ~5 October 2018.
http://www.esa.int/Our_Activities/Space_Science/BepiColombo/BepiColombo_Factsheet
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Message boards : Science (non-SETI) : Could mercury be the body that smashed into the earth and helped create the moon?


 
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