Question

what is a periodical comet​

Answer 1

Periodical comet is a comet that revolves around the sun and can be seen again in a detonate amount of time.

Ie it will pass by the earth after a certain time duration.

e.g. Halley's comet

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Answer 2

$\huge\underline\mathfrak{Answer}$

A periodical comet:-A comet which orbits around the star(sun) is known as a periodic comet.

$\huge\underline\mathfrak{Extra\:Information}$

▪️Most of the comets are named after a person who invented it.

▪️Some of the comets are named after a person who counted/calculated the orbits.

▪️The periodic comet can have same name.Example:-Nine shoemaker levy comets.

▪️Comets are the other celestial bodies in the solar system.Instead of them, asteroids,meteorites,meteors are there in the solar system.