Asteroids, Comets, and Meteoroids - PowerPoint PPT Presentation

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Asteroids, Comets, and Meteoroids

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Asteroids, Comets, and Meteoroids Comets Small bodies of ice, rock, and cosmic dust. Have highly elliptical orbits around the sun. Most originate in the Oort Cloud ... – PowerPoint PPT presentation

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Title: Asteroids, Comets, and Meteoroids


1
Asteroids, Comets, and Meteoroids
2
Comets
  • Small bodies of ice, rock, and cosmic dust.
  • Have highly elliptical orbits around the sun.
  • Most originate in the Oort Cloud (spherical cloud
    of dust and ice that lies far beyond Plutos
    orbit and that contains the nuclei of billions of
    comets).
  • Bright appearance results from sunlight reflected
    by the comets coma
  • Has Several Parts
  • core/nucleus
  • Coma (together with the core form the head of the
    comet)
  • Tail (always points a way from the sun because
    electrically charged particles from the sun push
    it away)

3
Famous Comets
  • Halleys Comet
  • Passes by Earth every 76 years
  • Last passed Earth in 1986
  • Will return in 2061
  • Comet Hale-Bopp
  • Passes by Earth every 5-10 years
  • Last passed by Earth in 1997

4
Asteroids
  • Fragments of rock that orbit the sun
  • Orbits are ellipses
  • Largest known asteroid is Ceres
  • Most are located in the asteroid belt between
    the planets Mars and Jupiter
  • Composition
  • Silicate minerals (look like earth rocks)
  • Iron and nickel (shiny metallic appearance)
  • Carbon (have a dark color and are rare)

5
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6
METEOROIDS
  • A small, rocky body that travels through space.
  • Most have a diameter less than 1 mm.
  • Most meteoroids burn up in the atmosphere due to
    increased friction with more molecules as it gets
    closer to Earth.

7
Meteor
  • Bright streak of light caused when a meteoroid
    burns up in the atmosphere.
  • Also known as shooting stars (click picture)
  • Picture to the right is a meteor shower.

8
Meteorite
  • Any part of a meteoroid that is left when a
    meteoroid hits Earth.
  • Three Types of Meteorites
  • Stony (similar to rocks on Earth)
  • Iron (metallic in appearance)
  • Stony-iron (contain iron and stone, are rare)
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