SOLAR SYSTEM

Detailed explanation-1: -Planets are usually more or less spherical in shape, usually bulging slightly at the equator. Comets are irregular in shape, with their longest dimension often twice the shortest.

Detailed explanation-2: -Comets are cosmic snowballs of frozen gases, rock, and dust that orbit the Sun.

Detailed explanation-3: -Because of their low mass, comet nuclei do not become spherical under their own gravity and therefore have irregular shapes.

Detailed explanation-4: -Comets are thought to orbit the sun in either the Oort cloud or Kuiper belt. When another star passes by the solar system, its gravity pushes the Oort cloud and/or Kuiper belt and causes comets to descend toward the sun in a highly elliptical orbit with the sun at one focus of the ellipse.