Comets, Asteroids and Meteors
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Comets, Asteroids and MeteorsPages 104-105What is a comet?Where are most comets found?Draw a picture of a comet and identify the different parts.
Describe their MOTION and how they change as they approach the sun?
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Comet (dirty snowball): collection of ice, dust and small rocks; long, narrow ellipses
* Head:Nucleus-solid inner coreComa-fuzzy (clouds of gases/dust)
outer layer* Tail:
Dust and GasesUp to 100, 000, 000 km longGrows as it approaches the sun in
its orbit*Most comets are found:Kuiper belt: area beyond our planets
(contains “icy” objects)Oort cloud: area beyond the Kuiper
belt
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Comets, Asteroids and MeteorsPage 106What is an asteroid?What are they made of?
How did they form?Where are most of them located?
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Asteroid: rocky objects that are too small (and too numerous) to call planets that
orbit the sun
Asteroid Belt: revolving asteroids locatedbetween Mars and Jupiter(separate theInner and Outer Planets)
Ceres (dwarf planet along with Pluto)
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Comets, Asteroids and MeteorsPage 107What is the difference between a meteoroid, meteor and a meteorite?
What are they made of?Where do they come from?
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•Meteoroid: chunk of rock or dust (from an asteroid or comet)
Meteor: a meteoroid burning due to Earth’s atmosphere
Meteorite: a meteoroid that survives Earth’s atmosphere and collides with Earth (resulting in a crater)