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Why are large astronomical bodies such as planets and stars round?

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gravity. A gravitational field creates a circle around the central point, in this case the core, typically a large amount of iron with other atoms following the gravitational waves. Here's an image that may help. If you don't understand then I will try my best to simplify.   
Why are large astronomical bodies such as planets and stars round?-example-1
User Joel Rondeau
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Large astronomical bodies such as planets and stars are round as a result of their own gravity. Gravity pulls astronomical bodies mass inwards towards their core causing it to even out and form a sphere. Although not a perfect sphere, more astronomical bodies more or less resemble a sphere.
User Simon Bagreev
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