What distinguishes a star from a planet?

Answer 1

Stars produce heat and light energy by fusion reaction inside their core. Planets only reflect light from stars.

The sun is a star, with a volume 1.3 million times that of Earth. The majority of stars are in the fourth state of matter, plasma, and planets orbit stars, reflecting only the light from the stars. Stars twinkle in the night sky, but planets do not because of atmospheric refraction.

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Answer 2

Luca de

Stars produce their own light through nuclear fusion, while planets do not generate light and instead reflect light from a star.

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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.