Differences in Comets, Asteroids, Meteoroids, Meteors and Meteorites. What is an impact crater.
What is a comet? Parts of a Comet.
Starting from Comets, they are Small icy pieces with other volatile material mixed with solid grains. Comets found in 2 main places in solar system Kuiper Belt at 45AU from the sun, which I told you in part 20 and in Oort Cloud at a distance of 50000AU. The Key Nucleus of Comet is mostly 1-10Km diameter consists mainly of ice and dust coated with dark organic material. While its Coma the cloud of gases that forms around the nucleus can be about 100,000Km. These gases are usually a mixture of water vapor, ammonia and carbon dioxide. A comet has two tails one made by coma a hydrogen envelope which is transparent and can reach nearly 10million km across and second its Iony tail which can go about 100million km. Comet becomes comet because of the solar heat and not because of Earth atmosphere. It becomes a comet with the tail when it enters in the solar system. The tail is always opposite in the direction of the sun because of solar winds i.e tail is behind comet when it is coming towards the sun and is in front of the comet when it is going away from the sun. Halley’s Comet is a short period comet returning after every 74-79 years since 239BC