Well a comet is much larger and is made of not only rock, but ice and other material. It also orbits the sun, but is on a different path than those of an asteroid.

On the left, a small, rocky, dark comet represents their typical size of one metre to a few hundred metres wide. On the right is a larger, icy, bright comet with a glowing tail, whose size ranges ...

Dubbed the "Christmas Comet" for its visibility during the holiday season and its greenish gleam, the celestial object flew within 7.4 million miles of Earth, which is about 30 times the distance ...

An icy volcanic comet that is three times as large as Mount Everest, nicknamed the "Devil Comet," erupted again Nov. 14. This is the fourth explosive event for 12P/Pons-Brooks since July 2023.

In 2017, astronomers found an object they’d never seen before. Now, it’s part of a growing category of elusive ‘dark comets’ – and we might find more soon.

Dark comets are often small, just a few metres to a few hundred metres wide. This leaves less surface area for material to escape and form into the beautiful tails we see on typical comets.