No. A comet can leave a large crater and, in the case of Earth, cause a mass extinction, but a comet cannot destroy a planet or even significantly change its orbit.
There are no comets on Neptune because Neptune is a planet and comets are, well, comets. They have nothing to do with each other.
Comets don't orbit a planet, they orbit the sun.
Meteroids or comets can impact on a planet.
comets crash into all planets!Planets don't have comets. Planets have moons. Comets orbit the sun
Comets.
The comets in our Solar System orbit our Sun. Presumably, a comet could be trapped by a planet, so that it orbits that planet; and presumably, there are also comets around other stars.
comets
Mohans or comets
There are no comets that orbit the planet Mars. Comets, some, orbit the sun. Mars on the other hand does have two moons, Phobos and Deimos.
you might be talking about Pluto, but its not considered a planet anymore.
(Comets are said to be "dirty snowballs")
saurn