Difference Between Asteroids, Meteors and Comets Part Three
Like asteroids, a comet orbits the Sun.
However, rather than being made mostly of rock, a comet contains a lot of ice and gas, which can cause amazing tails to form behind them due to the vaporization of ice and dust.
“They are anywhere from a few miles to tens of miles wide, but as they orbit closer to the Sun, they heat up and spew gas and dust into a glowing head that may be larger than a planet. “, NASA reported.