Uranus was slammed by an object twice the size of Earth

[Regolith]

https://bgr.com/2018/12/24/uranus-impact-simulation-history-research/

They've finally figured out why Uranus has a 90-degree axial tilt in relation to the plane of the solar system. Hit by a super-earth, apparently.

[gunsmith]

I'm not looking at Uranus tonight

[230RN]

Isn't that the same theory as to why we have a moon and a 23-1/2° tilt?  It's nice to get an idea of the size of the impactor necessary to tip Uranus over 90°.

[charby]

see below

[230RN]

Aw, jeeze.

http://www.armedpolitesociety.com/index.php?topic=59059.msg1190614#msg1190614

Can we apply the same kind of strictures to Uranus jokes?

It's like making jokes about the surname Colón.

Terry

[freakazoid]

I would think that something that size colliding would completely destroy the planet and send all the pieces flying out.

[230RN]

^
Depends on the relative velocities.

[K Frame]

My anus was recently slammed by a camera...

[230RN]

What was its relative velocity?

[HeroHog]

What was its relative velocity?

African or European? 

[230RN]

I always figure 1-1/2 or 2/3 as back-and-forth quickie conversion factors for miles versus kilometers.

My anus was recently slammed by a camera...

Yeah, Mike, thanks for bringing that up, here.
  :rolleyes:

[AJ Dual]

I would think that something that size colliding would completely destroy the planet and send all the pieces flying out.

It often did. And those planets aren't here anymore. Or near misses ejected one from the Solar System entirely,

And the ones that got hit "just so" to radically alter their nature, but not destroy them outright, like Earth with our unusually large moon (by proportion) or Uranus with its axis on its side with respect to the ecliptic, are still here to be seen.

Venus got smacked so hard it spins backwards.

Jupiter probably ate tons of protoplanets.

[K Frame]

'Venus got smacked so hard it spins backwards.'

Should have done that with my exwife

Sent from my SM-G960U using Tapatalk

[230RN]

[TommyGunn]

   Cats can be such fun ..... 

[freakazoid]

African or European? 

 

^
Depends on the relative velocities.

I suppose maybe a glancing blow. Shouldn't even something like that be very noticeable physical features wise, besides it's spin or tilt but something like a huge crater? Unless maybe it happened so long ago things weren't quite settled hardness wise and the planet was maybe more... fluid/maleable like?

[230RN]

Anything larger than about "200 km" to "500 km" will tend to pull itself into a spherical shape, depending on both the strength and density of its material.  Ice, call it 200 km, rock, call it 500 km.

This mechanism tends to make scars, even large ones, disappear unless one is using sophisticated iechniques to detect them.  The huge Chicxulub crater on the edge of the Yucatan Peninsula was not detected until oil well drilling in the gulf of Mexico revealed the shocked quartz characteristic of an ultra-high velocity meteor strike.



That one splattered debris over the whole planet and apparently, in combination with some extreme volcanic activity around the same time in Europe, killed off a lot of life on earth.  There's even a layer of this debris visible on the surface east of Denver CO.

Terry, 230RN

REF  (Or, how come planets end up being round):
VOLUME WARNING
https://youtu.be/SxdaXGgoQW8

See also "iridium layer"
Map credit in Properties.

[Jamisjockey]

I always figure 1-1/2 or 2/3 as back-and-forth quickie conversion factors for miles versus kilometers.

Yeah, Mike, thanks for bringing that up, here.
  :rolleyes:

Have a sense of humor.

[charby]

I suppose maybe a glancing blow. Shouldn't even something like that be very noticeable physical features wise, besides it's spin or tilt but something like a huge crater? Unless maybe it happened so long ago things weren't quite settled hardness wise and the planet was maybe more... fluid/maleable like?

Gaseous planet, like Jupiter. Not going to leave a crater.

[Scout26]

I recall reading that a large object stuck earth a long time ago, creating the Pacific Ocean and the remains/ejecta from the impact is what created the Moon.

[charby]

I recall reading that a large object stuck earth a long time ago, creating the Pacific Ocean and the remains/ejecta from the impact is what created the Moon.

I thought it was a Mars sized planet that collided, became oblong and superheated, spun off the moon.

https://www.washingtonpost.com/national/health-science/new-study-suggests-moon-spun-off-earth/2012/10/22/e3fda32a-1935-11e2-b97b-3ae53cdeaf69_story.html?utm_term=.2d9e85c916ff

Pacific ocean was formed, via plate tectonics. Moon is way older than the pacific ocean or water on the planet.

[MechAg94]

I think they did recently find another crate in Antarctica covered by ice.  I believe they think it corresponds closely with one of the other past extinction events.  It coincided closely with a large amount of volcanic activity.  The show I saw thought the impact initiated volcanic activity on the other side of the planet.

[Scout26]

I thought it was a Mars sized planet that collided, became oblong and superheated, spun off the moon.

https://www.washingtonpost.com/national/health-science/new-study-suggests-moon-spun-off-earth/2012/10/22/e3fda32a-1935-11e2-b97b-3ae53cdeaf69_story.html?utm_term=.2d9e85c916ff

Pacific ocean was formed, via plate tectonics. Moon is way older than the pacific ocean or water on the planet.

That's what I said:

From the Article

Two scientists are theorizing that the moon was once part of the Earth and that it formed after the Earth collided with another body.

The part is not that "it formed the Pacific Ocean", but that the "missing material" would basically equal what is "missing" if the Pacific was rock instead of water.

[charby]

That's what I said:

From the Article
The part is not that "it formed the Pacific Ocean", but that the "missing material" would basically equal what is "missing" if the Pacific was rock instead of water.

I linked the wrong article, sorry. I didn't word it correctly, I was going off a memory of a TV show, I think Nature from several years ago.

https://www.nature.com/news/planetary-science-lunar-conspiracies-1.14270



Also the Pacific ocean theory for the most part has been disproven. From NASA https://starchild.gsfc.nasa.gov/docs/StarChild/questions/question38.html

The Fission Theory:  This theory proposes that the Moon was once part of the Earth and somehow separated from the Earth early in the history of the solar system. The present Pacific Ocean basin is the most popular site for the part of the Earth from which the Moon came. This theory was thought possible since the Moon's composition resembles that of the Earth's mantle and a rapidly spinning Earth could have cast off the Moon from its outer layers. However, the present-day Earth-Moon system should contain "fossil evidence" of this rapid spin and it does not. Also, this hypothesis does not have a natural explanation for the extra baking the lunar material has received.

[gunsmith]

Aw, jeeze.

http://www.armedpolitesociety.com/index.php?topic=59059.msg1190614#msg1190614

Can we apply the same kind of strictures to Uranus jokes?

It's like making jokes about the surname Colón.

Terry

 Personally, I can't help making fun of Uranus.... I've been doing it since the third grade, that is also when I did a report on Lake Titicaca