Behind Neptune, we can find an outer zone known as the Kuiper zone. This region of the solar system consists of comets and miniplanets. The most famous miniplanet is Pluto, which was previously considered a planet.

Comets come from the Kuiper zone. When a comet travels towards the Sun, it will form a large tail of dust and gas. The comet travels around the Sun and continues its movement towards the outer reaches of the solar system. One of these journeys can take up to thousands of years.

A comet.