<ul><li>Fly across the sky day or night rarely. </li></ul><ul><li>When they fly across the sky at night they usually shine brighter than Venus and rarely brighter than the moon. </li></ul><ul><li>Several times a year, the meteors will fall out of the sky as a meteor shower. </li></ul><ul><li>Scientists started to study meteors when about 60,000 hit the earth. </li></ul><ul><li>There are different types of streams some are called persieds, eta aquarids, and many more. </li></ul>
<ul><li>A comet is a small, icy celestial body that orbits around the sun. </li></ul><ul><li>It is made up of a nucleus (solid, frozen ice, gas and dust), a gaseous coma (water vapor, CO 2 , and other gases) and a long tail (made of dust and ionized gases) </li></ul><ul><li>The tail can be up to 250 million km long, and is most of what we see </li></ul><ul><li>The coma is the roughly spherical blob of gas that surrounds the nucleus of a comet; it is about a million km across </li></ul>
<ul><li>An asteroid is any of numerous small planetary bodies that revolve around the sun. The belt contains more than 200 asteroids larger than 60 mile in diameter. Scientists estimate that there are more than 750,000 asteroids in the belt with diameters larger than 3/5 mile. </li></ul><ul><li>Astronomers are not sure how the asteroids originated. According to the leading theory, however, most known asteroids are the shattered remains of a smaller group of larger objects. These objects were left over from the time the planets </li></ul>
<ul><li>Halley's comet its named Halley’s comet because of how dark it is and its reflection percentage is .03 </li></ul>
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