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Author Topic: Why are planets round?  (Read 994 times)

Offline thedoc

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Why are planets round?
« on: 09/02/2014 13:30:01 »
Paul Anthony Weston <> asked the Naked Scientists:
   
Why are planets round, and not lumps of rock?

Paul Weston

What do you think?
« Last Edit: 09/02/2014 13:30:01 by _system »


 

Offline RD

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Re: Why are planets round?
« Reply #1 on: 09/02/2014 13:46:54 »
Why are planets round ...

A. by definition (#2) ...

Quote from: wikipedia.org
The definition of planet set in 2006 by the International Astronomical Union (IAU) states that, in the Solar System, a planet is a celestial body which:

1.   is in orbit around the Sun,
2.   has sufficient mass to assume hydrostatic equilibrium (a nearly round shape), and
3.   has "cleared the neighbourhood" around its orbit.
https://en.wikipedia.org/wiki/2006_definition_of_planet


B. because they are/were largely fluid , fluid in space forms a sphere (or an oblate spheroid if it is spinning) ...
« Last Edit: 09/02/2014 14:07:48 by RD »
 

Offline Aashish Karia

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Re: Why are planets round?
« Reply #2 on: 22/02/2014 22:04:45 »
I think it is because Gravity is the key, there is an equal amount of gravity pulling in mass on all sides which is why the atmosphere is a constant distance from ground even the surface is so unsmooth.
 

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Re: Why are planets round?
« Reply #2 on: 22/02/2014 22:04:45 »

 

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