SOLAR SYSTEM

Detailed explanation-1: -Their average diameters usually range from 750 meters (2, 460 feet) or less to about 20 kilometers (12 miles). Recently, evidence has been found for much larger distant comets, perhaps having diameters of 300 kilometers (186 miles) or more, but these sizes are still small compared to planets.

Detailed explanation-2: -As a rule of thumb, comets are about 10 km in diameter. Halley is about 16 x 8 x 8 km; Hale-Bopp was one of the biggest comets every seen, with a diameter twice that of Halley. But the typical comet is about 10 km in size, but of course is odd shaped since such small objects will not be spherical shaped.

Detailed explanation-3: -It is called the Bernardinelli-Bernstein comet and is at least 100 kms across, which makes it 1000 times larger than most comets humans have ever observed.

Detailed explanation-4: -Big, bigger, biggest Comet Bernardinelli-Bernstein-also known as C/2014 UN271 (and illustrated, far right)-is much larger than other known comets. It’s about 120 kilometers (75 miles) wide.

Detailed explanation-5: -The roughly potato-shaped, 9-mile-long (15 km) comet contains equal parts ice and dust, with some 80% of the ice made of water and about 15% of it consisting of frozen carbon monoxide.