The Astronomy Thread

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Burnem Wizfyre

Burnem Wizfyre

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According to this impact site, my 2,000 KM wide comet traveling at 56 km/s would destroy Mars, quite a huge blunder on my part
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http://janus.astro.umd.edu/cgi-bin/a...pact/impact.pl

edited because the links didn't go to where I wanted them.
 
Burnem Wizfyre

Burnem Wizfyre

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Araysar_sl said:
It can't be 2,000 Km wide, thats literally half the size of USA. An impact that huge would literally carve out another moon ala Earth's moon.
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Mars would be destroyed if it were hit by something that big, and not something I would be interested in seeing as that would likely be the end of us as well, pretty big fucking mistake on my part
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Araysar

Loser Araysar

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I actually went back and looked to see how big the asteroid was that created the earth's moon and they said it was a "mars sized body".

thats fucking crazy that the earth basically just sheared off a giant layer of the crust, instead of just being split in half.
 
Eomer

Eomer

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Araysar_sl said:
I actually went back and looked to see how big the asteroid was that created the earth's moon and they said it was a "mars sized body".

thats fucking crazy that the earth basically just sheared off a giant layer of the crust, instead of just being split in half.
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This link has some AVI files of simulations of what the impact may have looked like:http://www.boulder.swri.edu/~robin/moonimpact/

Suffice it so say that it wouldn't have just sheared off a layer of the crust.
 
Julian The Apostate

Julian The Apostate

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Araysar_sl said:
I actually went back and looked to see how big the asteroid was that created the earth's moon and they said it was a "mars sized body".

thats fucking crazy that the earth basically just sheared off a giant layer of the crust, instead of just being split in half.
Click to expand...
If it would have hit the earth straight on it would have been a lot different. Luckily it wasn't a straight on impact and just sort of grazed us.

Edit: After further research it may have been a more straight on impact. I thought I remembered hearing it was more of a grazing blow because it would have blown the earth to bits if it was a straight on shot, but I may be wrong.
 
iannis

iannis

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From what I remember of what i've seen of models of "it coulda happened this way. math" the small rock hits the big ass rock, either glancing or not. The big rock heats and deforms spewing out plenty of shit from around the impact site. Most of the shit spew either falls back into the big rock or it coalesces in a ring around the the big rock and condenses back into a small rock fairly quickly.

But the big rock has to be big enough that it's only deformed by the impact instead of shattered. The small rock has to be big enough to launch the shit-spew into orbit instead of being reabsorbed or just kicking material out into neighboring space.
 
Brad2770

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Julian, you were correct with your first hunch. If it had been a direct blow from the object that helped create Earth's moon, it would have destroyed the Earth. The glancing blow deposited most of the objects iron core into Earth's core (giving the Earth more iron in it's core than it should). It then sheared off most of the crust on both objects using that to make the moon. The moon still has an iron core, just not as much as it should. This also put a high spin on the earth, but the moons slower rotation has slowed the Earth down to 24 hours over millions of years.
 
Palum

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Brad2770_sl said:
Julian, you were correct with your first hunch. If it had been a direct blow from the object that helped create Earth's moon, it would have destroyed the Earth. The glancing blow deposited most of the objects iron core into Earth's core (giving the Earth more iron in it's core than it should). It then sheared off most of the crust on both objects using that to make the moon. The moon still has an iron core, just not as much as it should. This also put a high spin on the earth, but the moons slower rotation has slowed the Earth down to 24 hours over millions of years.
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Going to need the Genesis passage number on that one.
 
Brad2770

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Some recent episode of The Universe, I think. As mentioned above, there were various experiments using digital models and the direct impact with an object massive enough to create the moon obliterated the planet and the energy dispersed was greater than the gravity of the entire mass. It would have been asteroid belt 2.0. The only way it worked in the models was a more direct glancing blow. Anything not direct enough just knicked the planet.

I'll look for it once my Internet is back up, which should be on Monday.
 
K

Kedwyn

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Araysar_sl said:
I actually went back and looked to see how big the asteroid was that created the earth's moon and they said it was a "mars sized body".

thats fucking crazy that the earth basically just sheared off a giant layer of the crust, instead of just being split in half.
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Not only that but most of the cores from both planets essentially stuck with the earth giving us a much bigger core than we should have. In addition the super sized moon was a huge help in helping life especially at the start. Intercepted more than its fair share of impacts, massive tides (especially early on moving life from the oceans to land), slowing our rotation, helping prevent axis flips etc etc. Amazing really.
 
meStevo

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Brad2770_sl said:
Some recent episode of The Universe, I think. As mentioned above, there were various experiments using digital models and the direct impact with an object massive enough to create the moon obliterated the planet and the energy dispersed was greater than the gravity of the entire mass. It would have been asteroid belt 2.0. The only way it worked in the models was a more direct glancing blow. Anything not direct enough just knicked the planet.

I'll look for it once my Internet is back up, which should be on Monday.
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http://www.history.com/shows/the-uni...on-of-the-moon
 
Big Phoenix

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About 400 billion years ago, a catastrophic planetary impact created the moon and stabilized earth's orbit.
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Lawl, must of been a few universes ago.
 
Hekotat

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Anyone as skeptical as I am about these loud "booms" being heard around the world? Fake bullshit or the sign of end times?
 
chthonic-anemos

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We heard something a week ago but dismissed it as lightning or a jet. Though I did buy some milk and bread, just to be safe.

I'd feel a lot better about this if Lumie was still alive.
 
Tuco

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The 'weird noises all around the world' thing gets thrown around every few years. I remember one time it was marketing for some movie.
 
Hekotat

Hekotat

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Tuco_sl said:
The 'weird noises all around the world' thing gets thrown around every few years. I remember one time it was marketing for some movie.
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I know they did it for Mass Effect 3 and I wonder if people are just now seeing those videos and freaking out. I find it funny that these small town news anchors are running with it though.
 
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