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Why do planets orbits stars instead of other things in the universe?

Answer 1

Planets originated along with stars from a huge cloud of gas and dust..While condensing it received the angular momentum and planets seperated from stars and is orbiting the parent stars.

Both are parts pf a huge nebula and have common origin

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Answer 2

Theodore Angelis

Objects in the universe, like asteroids or comets, can orbit stars or other massive objects if they have the proper velocity and distance. Planets orbit stars due to the gravitational force between them, which causes the planets to continuously fall towards the star but also gives them enough sideways velocity to keep them in orbit.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.