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[RT] Violent, head-to-head crash between Earth and another planet created the moon - Page 2

post #11 of 72
Quote:
Originally Posted by Pen_Cap_Chew View Post

I thought this was fairly well known / old news?

It's been one of several hypotheses for a while, but it's emerging as the distinctly more likely one.
Quote:
Originally Posted by epic1337 View Post

well the community who's specific field is studying geological stuffs are pretty good at tracking lava (magma?) formations, so there should still be a mark that they could detect, like a birth mark or something.

It would have reliquefied the entire (and very new at the time) crust, or nearly so.

No obvious mark for the same reason there are no marks on an ice cube after you melt it and refreeze it, even if you smashed it before.

Think of it as two rain drops colliding, merging, and a small piece (the moon) separating as they spin...then freezing.
Quote:
Originally Posted by XiDillon View Post

How are we so sure that the impact didnt disturb the entire planet?

It's essentially impossible for an impact of this magnitude to do less than disturb the entire planet.
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post #12 of 72
Quote:
Originally Posted by Lady Fitzgerald View Post

And ten to twenty years from now, there will be yet another theory on how the moon was formed.

How true that is.

Here's where at least some of the theory comes from.

Enjoy!
http://www.tokenrock.com/explain-tiamat-planetary-theory-144.html
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post #13 of 72
Quote:
Originally Posted by Blameless View Post

It's essentially impossible for an impact of this magnitude to do less than disturb the entire planet.

Yup! Haha that's a good answer.
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post #14 of 72
Quote:
Originally Posted by epic1337 View Post

it was a theoretical assumption back then, and they're still trying to prove it till this day.

just one thing that bothers me though, such a massive collision should've left a mark on earth, where is that said mark? the pacific ring of fire?


The Earth is a liquid. It would simply return to its ball-like shape. You're thinking of how very tiny objects hit the earth and barely scratch the crust. The moon was formed during a cataclysmic event which would have completely changed every aspect of this thin layer of crust that we stand on.
post #15 of 72
Quote:
Originally Posted by epic1337 View Post

it was a theoretical assumption back then, and they're still trying to prove it till this day.

just one thing that bothers me though, such a massive collision should've left a mark on earth, where is that said mark? the pacific ring of fire?

I believe the mark is the molten core IIRC.
post #16 of 72
^ i was just checking for the same; 4.5 billion years ago the earth wasn't cooled down enough for a crust to form.
Quote:
The crash with Theia happened approximately 100 million years after the Earth formed, almost 4.5 billion years ago.
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post #17 of 72
Quote:
Originally Posted by Blameless View Post

It would have reliquefied the entire (and very new at the time) crust, or nearly so.

No obvious mark for the same reason there are no marks on an ice cube after you melt it and refreeze it, even if you smashed it before.

Think of it as two rain drops colliding, merging, and a small piece (the moon) separating as they spin...then freezing.
Quote:
Originally Posted by 8 Lug Mike View Post

The Earth is a liquid. It would simply return to its ball-like shape. You're thinking of how very tiny objects hit the earth and barely scratch the crust. The moon was formed during a cataclysmic event which would have completely changed every aspect of this thin layer of crust that we stand on.

thats assuming that those two objects have the exact same composition.

Quote:
Originally Posted by Hueristic View Post

I believe the mark is the molten core IIRC.
thats a very good hypothesis, so theia is a massive iron planet while earth is a massive basalt planet.
post #18 of 72
Quote:
Originally Posted by epic1337 View Post


...
thats a very good hypothesis, so theia is a massive iron planet while earth is a massive basalt planet.

I believe that is the current prevailing theory which sounds entirely feasible to me, but then again I'm no cosmologist nor geologist.
post #19 of 72
Quote:
Originally Posted by Lady Fitzgerald View Post

And ten to twenty years from now, there will be yet another theory on how the moon was formed.
Possibly, but I think they got this one pretty much right. There aren't many explanations for the existence of the Earth-Moon system in its current configuration that make any sense. The "Theia" hypothesis explains how the Earth could have such a large satellite, and how the Earth is so iron-rich compared to the Moon.

There are some things I think they're full of it on. I think "dark matter" and "dark energy" belong in the same category with Ptolemy's epicycles and Newton's lumineferous aether, stuff they made up to make their observations fit existing theory, rather than seriously question the veracity of the whole concept. But they're probably spot-on about how the Moon got to be where it is.
     
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post #20 of 72
Quote:
Originally Posted by epic1337 View Post

thats a very good hypothesis, so theia is a massive iron planet while earth is a massive basalt planet.

the earth always had iron; which an element on the periodic table whereas basalt is not - it's a composite of periodic elements.

but gold, siver, tin and water all came from accidental collisions from asteroids.

no, i am no expert - i just got done watching three seasons of "how the universe works" tongue.gif
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