Why are all planets round? (Thinkstock)
Why are all planets round?
Lexile

You asked us a question. "Why are all planets round?"
 
In a nutshell? Gravity.
 
We all know what gravity is. Right?
 
It is what makes apples fall from trees. And people fall flat on their faces.
 
The bigger an object is, the stronger its gravitational field.
 
And planets are pretty big. So gravity acts on them as a strong force. It pulls everything together towards their center.
 
And the ending shape is a sphere.
 
Planets are not perfectly round. They have a bit of what you might call a spare tire.
 
Planets spin around their axes. The force made by the spinning works against gravity. It causes a planet to bulge out at its equator.
 
Join the club, planets.

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CRITICAL THINKING QUESTION
Why aren't planets perfectly round?
Write your answers in the comments section below


COMMENTS (24)
  • makanip-
    12/03/2015 - 03:17 p.m.

    I don't know but this is OK to watch

  • makanip-
    12/03/2015 - 03:21 p.m.

    I don't know why plaints are round

  • ashleyc-bel
    12/04/2015 - 02:00 p.m.

    The reason why planets are perfectly round is because they have a bit of what you may call a spare tire.

  • silverc-bel
    12/04/2015 - 02:01 p.m.

    Because planets are just chunks of rocks that get pulled together.

  • taylort1-bel
    12/04/2015 - 02:01 p.m.

    The force made the spinning it works against gravity so that why it's not perfectly shaped.

  • averyg-bel
    12/04/2015 - 02:01 p.m.

    Gravity…gravity acts on the as a strong force.It pulls everything together towards their center and that leaves them round

  • jenniek-bel
    12/04/2015 - 02:02 p.m.

    They want to push all gravity out so then the planet doesn't fall from outer space.

  • hunterp-bel
    12/04/2015 - 02:03 p.m.

    The gravity causes it to baldge out in the middle or the axes.

  • elliew-bel
    12/04/2015 - 02:03 p.m.

    It said some of the planets have something like a spare tire.Also it says the force made by the spinning works against gravity.Also that causes it to budge out.

  • rahmrami117-hod
    12/07/2015 - 06:44 p.m.

    Why aren't planets perfectly round? Because the force of gravity pulls them towards the center and the force made by the spinning works against gravity.

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