Question

why comet is not a star

Answer 1

Stars (including the sun) make their own light. They glow on the ouside , hot enough to emit light. All other objects in the sky reflect sunlight, like planets and comets. A comet is actually a rather small object compared with planets. It has the size of a small asteroid (a few km wide) with (close enough to the sun) a millions km wide “coma” of weakly bounded gases that come out of the core.

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Answer 2

Answer:

Simply because the comets are small celestial bodies that are part of the Solar System and probably of every planetary system, widespread and observable in proximity to the Sun or the star in general, when their frozen core or in any case the volatile substances that make up the nucleus and atmosphere, start to heat ...