Comets, Asteroids, and Meteoroids - PowerPoint PPT Presentation

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Comets, Asteroids, and Meteoroids

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Comets, Asteroids, and Meteoroids Section 20.5 Comets Loose collections of ice, dust, and small rocky particles whose orbits are usually very long, narrow ellipses ... – PowerPoint PPT presentation

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Title: Comets, Asteroids, and Meteoroids


1
Comets, Asteroids,and Meteoroids
  • Section 20.5

2
Comets
  • Loose collections of ice, dust, and small rocky
    particles whose orbits are usually very long,
    narrow ellipses
  • Comet head is made of a solid inner core
    (nucleus) and a fuzzy outer layer (coma)

3
Comets
  • The coma forms when gases are released due to
    getting close to the sun
  • A comets tail is caused by gases streaming away
    from the sun

Head
Tail
4
Comets
  • Comets originate from the Kuiper belt (outside of
    Neptune) or the Oort cloud (surrounds the solar
    system)

5
Asteroids
  • Rocky objects that are too small and numerous to
    be considered planets
  • Most orbit between Mars and Jupiter (asteroid
    belt)
  • One hit Earth 65
  • million years ago
  • One could hit again

6
Meteors
  • Meteoroid chunk of rock or dust in space
  • Meteor a meteoroid that is burning up in
  • Earths atmosphere
  • Meteorite a meteor that doesnt
  • completely burn up and hits the
  • ground

7
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8
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