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Comets, asteroids, meteors

Comets, asteroids, meteors






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    Comets, asteroids, meteors Comets, asteroids, meteors Presentation Transcript

    • A. Comet: dust and rock particles combined with frozen water, methane, and ammonia.
    • 1. Halley’s comet: orbits Sun every 76 years.
    • 2. Oort Cloud: large group of comets surrounding solar system beyond Pluto.
    • 3. Amateur astronomers discovered Hale-Bopp in 1995.
    • 4. Comet structure: large dirty snowball of frozen rock and ice.
    • Comets
      • a. Ice and dust vaporize as comet nears Sun.
      • b. Vaporized material forms bright cloud called coma around comet nucleus.
      • c. Solar wind pushes on gas and dust in the coma, causing the particles to form a tail that always points away from the Sun.
      • d. Eventually, most of the ice in the comet’s nucleus vaporizes, leaving only small particles.
    • Comets vaporize and break up after passing close to the Sun several times. When the nucleus breaks up, pieces spread out. The dust and rock fragments are called Meteoroids .
    • B. (1.) Meteoroid : name given to small pieces of comet when they move through space.
    • B. (2.) Meteor : small meteoroid that burns up in Earth’s atmosphere.
    • B. (3.) Meteor Showers : occur when Earth’s orbit passes through a group of meteoroids that enter the atmosphere.
    • B. (4.) Meteorite : meteoroid that strikes Earth.
    • C. Asteroid : rock similar to that which formed planets.
    • C. (1.) Most asteroids lie in an asteroid belt located between Mars and Jupiter.
    • Asteroid Info:
      • Jupiter’s gravity may have kept these asteroids from forming a planet.
      • some planets’ moons may be asteroids pulled from the asteroid belt.
      • asteroid sizes range from very tiny to 940 km in diameter.
    • Near: The Near Earth Asteroid Rendezvous probe indicates asteroid 433 Eros has been in many collisions over time.
    • What is a shooting star?
      • It is NOT a star!!
    • Look Familiar??????
    • Shooting Star:
      • A meteor that is burning up in the Earth's atmosphere. A.K.A. a Meteor!!