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