2 Comets Loose collections of ice, dust, and small rocky particles Orbits are usually very long, narrow eclipsesWhen orbit come close to Sun, it heats up, ice turns into gas, releasing dust
3 Structure of a Comet Coma – gas and dust that form an outer layer Nucleus – inner layer of cometTail – can stretch for millions of kilometers
4 Where are comets found?Kuiper belt – disc-shaped region of icy objectsbeyond the orbit of Neptune (billions of kilometers from our sun)Oort Cloud – spherical cloud of cometsSpans 30 trillion kilometers from the sun
10 Comet Shoe-Maker Levy 9 Short periodic comet 1993 collided with Jupiter
11 Meteoroid Come from comets or asteroids Chunk of rock or dust in space Fun Fact:On average a meteor streaks overhead every 10 minutes!
12 The Life of a Meteoroid Comets or asteroids break to create a meteroid Meteroid enters Earth’s atmosphere meteor (burns up in the sky)Meteroid passes through Earth’s atmosphere and hits Earth’s surface meteorite
13 Meteor ShowersOctober 20, 2011 – pieces of Halley’s comet
14 Asteroids Rocky objects revolving around the sun Too small and numerous to be planetsAsteroid belt found between Mars and JupiterAsteroid Ida
15 Asteroid BeltWhere the majority of asteroids are found
16 Big Bang Theory 65 million years ago Yucatan Pennisula, Mexico Crater 200 kilometers in diameter
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