Discuss Why are the Planets almost round? in the Electricians Chat - Off Topic Chat area at ElectriciansForums.net

Go on take the Mick not bothered, I couldn't sleep last night so I got up and started watching some NASA documentary's, one described how some Scientists reasoned that the Earth and the Moon, along with other planets within our Solar System, were created by giant collisions millenniums ago, so to my question, how come Planets areas near spherical as you can get for something as big as they are, surely if they were created by collisions they would be ragged in appearance, but most appear to be spherical, what do you all reckon? A bit deep for an early morning thread, but hey ho.

While you were watching that Pete I spent the hour watching a documentary about James Clerk Maxwell & electromagnetism
 
You should download the series called ‘one strange rock’
10 part documentary narrated by will smith but with astronoughts giving the scientific facts about various different subjects.
 
The earth bulges at the equator , and the moon is un-even enough to always be pointing the same way towards us, due to gravity (Displaced c-o-g )
... Dark side of moon moment.
Gravity and the efficiency of maths - smallest volume is a sphere.
..Random thought= Solder Balls..
 
A little interesting fact for you,

The "gas" giant Jupiter has a layer of hydrogen & helium gas which is so dense under the immense pressure that it has formed an ocean of liquid metal.
The giant red spot is an immense storm in the atmosphere that they believe has been raging for hundreds-thousands of years. The spot is larger than the Earth!
upload_2018-8-14_11-7-38.jpeg

In answer to Pete, in layman's terms, mass is always attracted to the centre of gravity. At some point the surface tension will give up under the immense pressure from the weight of the mass so the object settles into a sphere because that is the only natural shape where any point on the surface becomes roughly equidistant from the centre of gravity.
Hydrostatic Equilibrium:
In astrophysical terms, hydrostatic equilibrium refers to the state where there is a balance between the outward thermal pressure from inside a planet and the weight of the material pressing inward. This state occurs once an object (a star, planet, or planetoid) becomes so massive that the force of gravity they exert causes them to collapse into the most efficient shape – a sphere.

Typically, objects reach this point once they exceed a diameter of 1,000 km (621 mi), though this depends on their density as well
 
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i've watched a few episodes of "Drain the Oceans". I wonder how well their wet/dry vax will work with a wall chaser.probably suck all that nasty dot&dab away into outer space where it should be.
 

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