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Author Topic: Why are planets round?  (Read 10200 times)

Offline Karen W.

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Why are planets round?
« on: 14/07/2009 01:50:48 »
WELL I WAS THINKING ABOUT NATURALLY ROUND THINGS AND THE EARTH AND PLANETS CAME TO MIND.

SO IS IT THE ROTATION THAT SHAPES THEM IN A ROUNDED FORMATION. IF IT IS WHY DOES IT NOT JUST GET MORE ELLIPTICAL.. HOW DOES IN KEEP THE BALANCE FROM LEFT TO RIGHT AND TOP TO BOTTOM?

Sorry for the caps!
« Last Edit: 23/07/2009 21:11:11 by chris »


 

Offline Chemistry4me

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Re: Why are planets round?
« Reply #1 on: 14/07/2009 02:07:09 »
HOW DOES IN KEEP THE BALANCE FROM LEFT TO RIGHT AND TOP TO BOTTOM?
The answer is gravity.

Quote
Planets are round because their gravitational field acts as though it originates from the center of the body and pulls everything toward it. With its large body and internal heating from radioactive elements, a planet behaves like a fluid, and over long periods of time succumbs to the gravitational pull from its center of gravity. The only way to get all the mass as close to planet's center of gravity as possible is to form a sphere. The technical name for this process is "isostatic adjustment."

With much smaller bodies, such as the 20-kilometer asteroids we have seen in recent spacecraft images, the gravitational pull is too weak to overcome the asteroid's mechanical strength. As a result, these bodies do not form spheres. Rather they maintain irregular, fragmentary shapes.

http://www.scientificamerican.com/article.cfm?id=why-are-planets-round
 

Offline neilep

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Re: Why are planets round?
« Reply #2 on: 14/07/2009 02:13:54 »
Planets are round because if they were triangular they would look silly !


Glad I could help.
 

Offline Karen W.

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Re: Why are planets round?
« Reply #3 on: 14/07/2009 02:25:40 »
HOW DOES IN KEEP THE BALANCE FROM LEFT TO RIGHT AND TOP TO BOTTOM?
The answer is gravity.

Quote
Planets are round because their gravitational field acts as though it originates from the center of the body and pulls everything toward it. With its large body and internal heating from radioactive elements, a planet behaves like a fluid, and over long periods of time succumbs to the gravitational pull from its center of gravity. The only way to get all the mass as close to planet's center of gravity as possible is to form a sphere. The technical name for this process is "isostatic adjustment."

With much smaller bodies, such as the 20-kilometer asteroids we have seen in recent spacecraft images, the gravitational pull is too weak to overcome the asteroid's mechanical strength. As a result, these bodies do not form spheres. Rather they maintain irregular, fragmentary shapes.

http://www.scientificamerican.com/article.cfm?id=why-are-planets-round
Think you so much C4M... I had no idea. That is really interesting...
 

Offline Karen W.

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Re: Why are planets round?
« Reply #4 on: 14/07/2009 02:27:11 »
Planets are round because if they were triangular they would look silly !


Glad I could help.

LOL...LOL....Yes yes they would but they might be kind of cool!

Glad that you could help too!
 

Offline neilep

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Re: Why are planets round?
« Reply #5 on: 14/07/2009 02:28:36 »
A triangular planet would be great for sledging down in the winter !
 

Offline Karen W.

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Re: Why are planets round?
« Reply #6 on: 14/07/2009 05:32:06 »
YES IT WOULD AND I SPLIT THE TOPIC...

http://www.thenakedscientists.com/forum/index.php?topic=24235.0

So if the right atmospheric changes took place could the shapes of planets change?
« Last Edit: 14/07/2009 05:34:09 by Karen W. »
 

ScientificBoysClub

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Re: Why are planets round?
« Reply #7 on: 15/07/2009 10:18:03 »
HOW DOES IN KEEP THE BALANCE FROM LEFT TO RIGHT AND TOP TO BOTTOM?
The answer is gravity.

Quote
Planets are round because their gravitational field acts as though it originates from the center of the body and pulls everything toward it. With its large body and internal heating from radioactive elements, a planet behaves like a fluid, and over long periods of time succumbs to the gravitational pull from its center of gravity. The only way to get all the mass as close to planet's center of gravity as possible is to form a sphere. The technical name for this process is "isostatic adjustment."

With much smaller bodies, such as the 20-kilometer asteroids we have seen in recent spacecraft images, the gravitational pull is too weak to overcome the asteroid's mechanical strength. As a result, these bodies do not form spheres. Rather they maintain irregular, fragmentary shapes.

http://www.scientificamerican.com/article.cfm?id=why-are-planets-round
you gave cool answer !!
 

Offline Karen W.

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Re: Why are planets round?
« Reply #8 on: 19/07/2009 10:44:18 »
So that would be without rotation at all correct? So what if the rotation just slowed to a crawl...? Would it still be round or gradually more elliptical?

What other changes might take place in our atmosphere and on the Earth if this the Earth as we know it began to slow to a crawl...?

What about life etc..and temperature?
« Last Edit: 23/07/2009 06:54:02 by Karen W. »
 

Offline Chemistry4me

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Re: Why are planets round?
« Reply #9 on: 20/07/2009 05:15:32 »
What other changes might take place in our atmosphere and on the Earth if this the Earth as we know it began to slow to a crawl...? What about life etc..and temperature?
Erm...I believe the Earth will be pulled in towards the Sun and everything will be annihilated.
 

Offline Karen W.

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Re: Why are planets round?
« Reply #10 on: 20/07/2009 05:16:33 »
OH NO.... That would suck!(No pun intended)
 

Offline Chemistry4me

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Re: Why are planets round?
« Reply #11 on: 20/07/2009 05:18:17 »
Well, it's like spinning a bucket of water over your head, if you do it fast enough, the waters stays in there, but once you slow down...

 

Offline Karen W.

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Re: Why are planets round?
« Reply #12 on: 20/07/2009 18:13:24 »
Are you saying I am a DOG and a wet one at that???
« Last Edit: 20/07/2009 23:14:37 by Karen W. »
 

Offline Chemistry4me

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Re: Why are planets round?
« Reply #13 on: 21/07/2009 06:15:25 »
I don't know. Only if you want to be. :)
 

Offline Karen W.

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Re: Why are planets round?
« Reply #14 on: 21/07/2009 06:52:39 »
LOL...LOL...bow wow!

So if everything is annihilated then that leaves no room to see how things  work! but what about the ball of earth itself minus all vegetation etc.. would micro organisms live in he soil, and begin a new or what? What do you think?
 

Offline Chemistry4me

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Re: Why are planets round?
« Reply #15 on: 21/07/2009 06:58:27 »
but what about the ball of earth itself minus all vegetation etc.. would micro organisms live in he soil, and begin a new or what? What do you think?
It might take another couple of billion years (apparently) to get back to how it is. But then the Sun might blow up sometime around there (maybe  :-\) and we'll all be annihilated anyhow  [xx(]
 

Offline Karen W.

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Re: Why are planets round?
« Reply #16 on: 21/07/2009 07:10:29 »
oooh noooooo. we have to think positive, eh?
 

Offline Chemistry4me

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Re: Why are planets round?
« Reply #17 on: 21/07/2009 07:12:22 »
Yes, after all one billions year is um...1,000,000,000 years, depending on where you come from...
 

Offline Karen W.

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Re: Why are planets round?
« Reply #18 on: 21/07/2009 07:17:18 »
LOL..yes indeed....where have you come from C4M?
 

Offline Chemistry4me

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Re: Why are planets round?
« Reply #19 on: 21/07/2009 07:21:18 »
Umm...New Zealand.  :D
It's just that in some countries 1,000,000,000,000 is a billion (I think).
 

Offline Stefanb

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Re: Why are planets round?
« Reply #20 on: 22/07/2009 07:08:50 »
Wait... since when are planets round?
I fell off the edge of the world yesterday...
 

Offline Chemistry4me

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Re: Why are planets round?
« Reply #21 on: 22/07/2009 08:32:45 »
Wait... since when are planets round?
Since a couple of years ago.
 

Offline Karen W.

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Re: Why are planets round?
« Reply #22 on: 23/07/2009 06:51:21 »
Wait... since when are planets round?
I fell off the edge of the world yesterday...

Hummmmm well I think there was this fellow Named Columbus......LOL...LOL.... Yes I have done that a few times and cracked my nut..can't you tell? LOL..LOL..
« Last Edit: 23/07/2009 06:56:29 by Karen W. »
 

Offline Karen W.

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Re: Why are planets round?
« Reply #23 on: 23/07/2009 06:52:15 »
Umm...New Zealand.  :D
It's just that in some countries 1,000,000,000,000 is a billion (I think).

UMMMMMMM You had me worried there for a minute! LOL...LOL..
 

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Re: Why are planets round?
« Reply #23 on: 23/07/2009 06:52:15 »

 

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