Comets were discovered by danish astronomer tycho brahe

• Comets were discovered by danish astronomer tycho brahe in 1577. • Haleys comet was named after comond halley. • Isaac newton showed that a comets movements are much like the same laws that control the planets orbits.

• Comets are usually about 9. 2 million miles from earth. • Sometimes comets get in the way of another comet and they will collide.

• Comets have an icy body. Therefore they are super cold. • The atmosphere around a comet is a gas cloud.

• There are many different kinds of comets. This is a list of them: Main belt comets, centaurs, krentz sungrazers, short period comets, and great comets.

• The physical characteristics of comets are that they have an icy body that releases gas or dust.

• No life on comets could not exist because comets are made of ice, dust, and little pieces of rocks; therefore it is impossible to go to a comet.

• Asteroids were made when something hits a planet or moon and a piece of rock chips off. • Asteroids are known to be grouped together in an asteroid belt.

• The main asteroid belt is about 5 km from the earth.

• Asteroids are made of rocky chunks of matter in orbit around the sun.

• Asteroids are varied in their composition. • Most are made of rock, but some are composed of metals and other materials.

• Asteroids range in size and are just rocks.

• Life could not exist on an asteroid because it is just a giant rock.

• Every asteroid is different because of the different sizes, orbits, and compositions; But the average asteroid in the asteroid belt is about -150 C. • Around an asteroid is usually rocks, cold ice, dust, and other minerals.

• They have only found 7 meteoroids that have hit earth in history. • All of the 7 that hit earth were large impact.

• Most meteoroids move close to the earth, however, only few of them hit earth. The rest of them just pass by.

• Meteoroids are 3. 5 x more dense then an earth rock • Their size is at least the size of speck of dust but smaller then an asteroid. • Meteoroids are made of a small piece of dust, rock, ice, or metal.

• Meteoroids are mainly iron. • Meteoroids temperature depends on weather in sunlight or moonlight. • Move at light speed.

• No life could not exist because a meteoroid is just a fast moving space rock and will get to cold and to hot.