Question

comet is not a star why

Answer 1

stars including the sun emit their own light .they glow on the outside 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 a size of a small asteroid (a few kilometre wide) .with (close enough to the sun) a millions kilometre wide "coma"of weakly bounded gases that come out of the core .

comets also don't flash through the sky like a meteor with their tail lagging behind them .if you are lucky enough to see a comet it appears stationary between the stars during a particular evening .from day to day its position changes slowly and their tails have pointed away from the sun and can actually make a large angle with the direction of its velocity .

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Answer 2

i have two answers:-

in the simplest terms, a star generates it’s own light by a process of nuclear reaction. A comet does not… it is simply a body of ice/rock/whatever travelling through space. It is lit up by the stars it passes which are shining light on it.

There are many other differences between the two - such as size, movement, and so on… but basically, a star is like our sun. A comet is like a rock flying through space.

Hi friend.... here's your answer.....

We classify something as a star when it is: a large ball of gas that undergoes nuclear fusion. Given this definition, a comet is not a star. A comet is a ball of ice and dirt hurtling through space, it shines only because it reflects light. As a comet gets close to a star, it begins to boil of some of its ice, this gives the comet a tail, and since it's so diffuse and wide spread it can reflect a lot of light, this is why it would appear bright like a star. 

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