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Traces of another world found on the Moon

planetary formation earth moon apollo theia

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#1    Waspie_Dwarf

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Posted 05 June 2014 - 06:07 PM

Traces of another world found on the Moon


www.bbc.co.uk said:

Researchers have found evidence of the world that crashed into the Earth billions of years ago to form the Moon.

Analysis of lunar rock brought back by Apollo astronauts shows traces of the "planet" called Theia.

The researchers claim that their discovery confirms the theory that the Moon was created by just such a cataclysmic collision.

The study has been published in the journal Science.

The accepted theory since the 1980s is that the Moon arose as a result of a collision between the Earth and Theia 4.5bn years ago.

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#2    SaraT

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Posted 06 June 2014 - 10:44 AM

It's at least nice to know the name of the planet which struck us.  :/


#3    Eldorado

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Posted 06 June 2014 - 11:00 AM

Will Theia come back again?


#4    Noteverythingisaconspiracy

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Posted 06 June 2014 - 11:06 AM

View PostEldorado, on 06 June 2014 - 11:00 AM, said:

Will Theia come back again?

It never left !

Theia and the Earth melted together on the impact, and the debris left over became the Moon.

So you might say Theia is part of us all. :tu:

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#5    Sundew

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Posted 06 June 2014 - 12:42 PM

Interplanetary billiards. One little tryst between planets and out pops a baby moon.


#6    Merc14

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Posted 06 June 2014 - 01:12 PM

What a site these collisions in the early solar system must have been.

Another article on this discovery http://www.extremete...opment-lives-on

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#7    Astra00

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Posted 06 June 2014 - 01:34 PM

View PostMerc14, on 06 June 2014 - 01:12 PM, said:

What a site these collisions in the early solar system must have been.

Another article on this discovery http://www.extremete...opment-lives-on
Yes, imagine what a beautiful and awesome sight it would have been.
I know that we came eons and eons of time and space later....but we are still all apart of the magnificence. :-*

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#8    Silent Trinity

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Posted 06 June 2014 - 01:37 PM

My word the Earth has had a rough trot, makes you wonder how we managed to survive this long given the cosmic warfare going on around throughout the eons....

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#9    Dark_Grey

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Posted 06 June 2014 - 01:51 PM

View PostSilent Trinity, on 06 June 2014 - 01:37 PM, said:

My word the Earth has had a rough trot, makes you wonder how we managed to survive this long given the cosmic warfare going on around throughout the eons....

Humanity has had a few close calls...

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#10    Merc14

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Posted 06 June 2014 - 01:56 PM

View PostAstra00, on 06 June 2014 - 01:34 PM, said:

Yes, imagine what a beautiful and awesome sight it would have been.
I know that we came eons and eons of time and space later....but we are still all apart of the magnificence. :-*

Absolutely!  One theory goes that the blast of a Supernova is what would start the accretion of the dust clouds into larger and larger bodies while simultaneously seeding the cloud with the heavy elements necessary for life and planet formation, so as the saying goes, we are all stardust.

View PostSilent Trinity, on 06 June 2014 - 01:37 PM, said:

My word the Earth has had a rough trot, makes you wonder how we managed to survive this long given the cosmic warfare going on around throughout the eons....

Without the gas giants playing goalkeeper for us I'd guess we'd have been getting smashed quite a bit more often and we probably woudn't be here!  The Permian extinction, 256 million years ago, was the most destructive extinction in earth's history with 96% of all marine species dying off and nearly as many land animals, including insects also going extinct.

Edited by Merc14, 06 June 2014 - 02:14 PM.

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#11    Frank Merton

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Posted 06 June 2014 - 02:10 PM

View PostDark_Grey, on 06 June 2014 - 01:51 PM, said:



Humanity has had a few close calls...
If there was any life on the earth then it was obliterated and had to start over.

Neither Mars nor Venus have at this time much of a magnetic field, and ours has been present steadily ever since the collision that resulted in the moon and probably as a result of the extra heat the earth got in the event.  

One wonders if being such an "almost double planet" originating in such a collision is part of the conditions necessary for billions of years of evolution, both the magnetic field and plate tectonics (although that would also require a source of hydration that as I understand it has not been fully worked out).  If so, life or at least advanced multi-cellular life may well turn out to be extremely rare even if the galaxy is populated by millions of earth size planets circling sun like stars in the Goldilocks zone.  In short we have poor values for many of the elements in the Drake equation, and there may be other variables he didn't think of.


#12    paperdyer

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Posted 06 June 2014 - 03:37 PM

This theory sure beats the one that was thrown around a few months ago that our Moon was stolen from Venus. One thing that always puzzled me is how did all the planets form so roundish as they did.  If everything was colliding in various directions, I would have expected a few capsule shapes or box-like shapes.

"The difference is too small," he said. "We don't know how the Moon was formed. What we need are manned missions to the Moon and a search for rocks deeper under the lunar surface, that have not been polluted by meteorite impacts and the solar wind."

Yep - let's send some bull dozers and excavation to the Moon to evaluate the rocks.  Solar powered of course.

Edited by paperdyer, 06 June 2014 - 03:43 PM.


#13    Noteverythingisaconspiracy

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Posted 06 June 2014 - 04:02 PM

View Postpaperdyer, on 06 June 2014 - 03:37 PM, said:

This theory sure beats the one that was thrown around a few months ago that our Moon was stolen from Venus. One thing that always puzzled me is how did all the planets form so roundish as they did.  If everything was colliding in various directions, I would have expected a few capsule shapes or box-like shapes.

It is basically because gravity will naturally tend to form a star, planet or moon into a sphere. All planets and moons above 1.500 kilometers in diameter are spheroid.
(Technically the Earth  isn't round, it's an oblate spheroid :innocent: )

http://en.wikipedia....um#Astrophysics

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#14    Rhino666

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Posted 06 June 2014 - 04:32 PM

Samples from the moon. It's taken them this long to work it out.!


#15    Waspie_Dwarf

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Posted 06 June 2014 - 04:38 PM

View PostRhino666, on 06 June 2014 - 04:32 PM, said:

Samples from the moon. It's taken them this long to work it out.!

Analytical techniques are fare better than they were in the sixties and seventies when the rocks were brought to Earth. It's not really surprising that new discoveries are still being made.

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