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

post #1 of 72
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Quote:
New clues suggest the moon resulted from a head-on collision between Earth and another forming planet, according to scientists.
 

Researchers from a team lead by the University of California, Los Angeles (UCLA) analyzed lunar and volcanic rocks before concluding the moon was formed during a violent head-on collision between an early Earth and another forming planet called Theia.

 

Source:

https://www.rt.com/usa/330681-earth-planet-crash-moon/

 

I don't have an account at Science.com so I linked RT instead.

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post #2 of 72
I thought this was fairly well known / old news? I recall watching a documentary maybe 3-4 years ago that seemed to state the moon creation theory as a pretty well agreed fact.
post #3 of 72
Quote:
Originally Posted by Pen_Cap_Chew View Post

I thought this was fairly well known / old news? I recall watching a documentary maybe 3-4 years ago that seemed to state the moon creation theory as a pretty well agreed fact.

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?
post #4 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 suppose so, I mean .. we have deep oceans so wouldn't it be logical that by the time Luna hit it'd be filled with water by now? I still think it was just a few balls of rock pulled into orbit more than anything ..

.. Hell for all we know Aliens just plonked them all the planets in a great intergalactic game .. whomever hit Jupiter must've been a pro at the game! (63 moons last I heard )
post #5 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?

Earth was still molten rock and was 90% of its current size when the impact occured, so an indent would have been filled by surrounding lava. The current 24 hour day is believed to have been caused by the off center impact.
post #6 of 72
Quote:
Originally Posted by llythrus View Post

Earth was still molten rock and was 90% of its current size when the impact occured, so an indent would have been filled by surrounding lava. The current 24 hour day is believed to have been caused by the off center impact.

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.
post #7 of 72
How are we so sure that the impact didnt disturb the entire planet? Why then would there need to be a mark being that it isnt a surface wound? Even with that, how are we sure that the surface as a whole isnt exactly whats to show for it?
post #8 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?

For the most part, earths crust erodes, slides, and falls from the highest points to the lowest points ever 100 million years. Over 1 billion years, the surface of the earth is completely replaced with a new layers. We really don't have any rock that would date back to the collision with the moon. It has all been eroded and sucked under other plates by now.

There are a few places that are order then 1 billion. Antarctica has places that are 2 billion years old. Australia has places that are 4 billion years old.

But even then, the rock formations are only meters long.

The earth does a really good job of scraping off the old stuff and replacing it by new stuff.

Take a look at the last 600 million years. You will see why there is no crater.

https://i.imgur.com/69Tq6.gif


llythrus-

Kind of correct, but not for that reason.

If you look at mars, it has a day length of 24 hour 40 minutes.

Earth was probably spinning around it axis between 2.5 hour to 110 hours a day. (honestly we don't know) Could have been 24 hours long.

When the proto planet smack into us. It quickened the earth day to 6 hours.

The moon then caused drag between us and the water on the earth. Which has been slowing us down over time.

When life first started on this planet, the day time was about 16 hours.

When the dinosours where walking around it was about 18-22 hours.

By the time humans started to use tools, it was about 24ish hours long.

200 million years from now, it will be 25 hours long.

1 billion years from now it will be only 27 hours long.

If you are wondering, as the moon drifts futher away, it causes less drag. So the slowing effect is less.
And every one loves to argue this.
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post #9 of 72
Quote:
Originally Posted by RiverOfIce View Post


llythrus-

Kind of correct, but not for that reason.

If you look at mars, it has a day length of 24 hour 40 minutes.

Earth was probably spinning around it axis between 2.5 hour to 110 hours a day. (honestly we don't know) Could have been 24 hours long.

When the proto planet smack into us. It quickened the earth day to 6 hours.

The moon then caused drag between us and the water on the earth. Which has been slowing us down over time.

When life first started on this planet, the day time was about 16 hours.

When the dinosours where walking around it was about 18-22 hours.

By the time humans started to use tools, it was about 24ish hours long.

200 million years from now, it will be 25 hours long.

1 billion years from now it will be only 27 hours long.

If you are wondering, as the moon drifts futher away, it causes less drag. So the slowing effect is less.
And every one loves to argue this.

My post glossed over some stuff, but what I meant was that the impact caused the Earth to spin or add to the Earth's spin, which later results in our 24 hour day. As far as why there is no crater, here is a video of a simulation of the impact between Earth and a large object. If you watch the video, you can see that most of the debris had fallen back to Earth shortly and Earth regains its spherical shape with little if any indentation. Also, any crust would have been destroyed by an impact of this magnitude.
post #10 of 72
And ten to twenty years from now, there will be yet another theory on how the moon was formed.
     
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