Gravity is the force that keeps us on our planet by drawing us so powerfully towards its centre. It has much the same effect on everything else floating in the cosmos, as long as it is big enough. All objects in the Universe are subject to their own force of gravity. It is one of the fundamental forces of our Universe.
As gravity pulls matter towards other matter, a sphere forms. Why? Only a sphere allows every point on its surface to have the same distance from the centre, so that no part of the object can further ‘fall’ toward its centre.
Smaller objects in space are spared from the overwhelming power of gravity, which is why we see asteroids that look like pieces of rubble. Why do these bodies have the shape that they have? Their shape arises from a simple electrostatic force.
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