Why are all planets round?
Why are all planets round? (Thinkstock)
Why are all planets round?
Lexile: 1110L
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You asked us, "Why are all planets round?" and in a nutshell, it's gravity.
 
We all know what gravity is, right?
 
It's what makes apples tumble from trees and people fall flat on their faces, and 
well, the bigger an object is, the stronger its gravitational field.
 
Planets are pretty big, so gravity acts on them as a strong force, pulling everything together towards their center and the resulting shape is a sphere.
 
Now, planets aren't actually perfectly round, they've got a bit of what you might call a spare tire.
 
You see, planets spin around their axes and the force generated by the spinning works against gravity and causes a planet to bulge out at its equator.
 
Join the club, planets.

Source URL: https://www.tweentribune.com/article/teen/why-are-all-planets-round/

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


COMMENTS (14)
  • ShawnaWeiser-Ste
    12/08/2015 - 04:12 p.m.

    I honestly thought the reason they were so round was because of a way more scientific reason. In reality it was only gravity. Amazing how little things make a huge impact on things.

  • reyvanf-pay
    12/11/2015 - 11:55 a.m.

    Gravity is the reason why planets are round. Gravity pulls everything around into the center and this creates this sphere shape. But they are not perfectly round because the force of the spin defines gravity.

  • jacobp123456791-
    12/14/2015 - 09:01 a.m.

    Because the spin of a planet goes against gravity and causes it to bulge out on their equator.

  • malavikab1-lin
    12/18/2015 - 02:30 p.m.

    I think planets are not perfectly round because they spin around their axes and the force generated by the spinning works against the gravity and causes the planet to not be perfectly round.

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