Comets

A comet (KOM iht) is an icy body that releases gas or dust. Most of the comets that can be seen from Earth travel around the sun in long, oval orbits. A comet consists of a solid nucleus (core) surrounded by a cloudy atmosphere called the coma and one or two tails. Most comets are too small or too faint to be seen without a telescope. Some comets, however, become visible to the unaided eye for several weeks as they pass close to the sun. We can see comets because the gas and dust in their comas and tails reflect sunlight. Also, the gases release energy absorbed from the sun, causing them to glow. Astronomers classify comets according to how long they take to orbit the sun. Short-period comets need less than 200 years to complete one orbit, while long-period comets take 200 years or longer.(Hailey-3BTeam Uranus) Comet is from the Greek words for "hairy star".Comet nuclei range from about 100 yards to 25 miles (100m to 40 km) in daimeter.(Ava-3B Team Saturn)
 * Halley's Comet becomes visible to the unaided eye about every 76 years as it nears the sun. Image credit: Lick Observatory ||
 * Halley's Comet becomes visible to the unaided eye about every 76 years as it nears the sun. Image credit: Lick Observatory ||

Sometimes Comets can be seen from earth (Ben M - 3B)

Comets are part of the solar system. Comets aren't made of solid rock thay are made of dust,stones,ice,and gases. People used to be afraid of comets thay thought it ment wars,flods,and fires.