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					      ASTEROIDS,
    METEORITES, AND
        COMETS
In this lesson you will learn about the
following from the Utah State core:
•Explain how meteorite impacts could that
contribute to the extinction of a species.
•Explain evidence supporting the theory of
impacts causing large-scale extinctions in the
past.
     ASTEROID
A piece of rock, smaller than a
 planet, that orbits the sun;
   mostly between Mars and
 Jupiter in an area called the
         asteroid belt.
                      (Gaspra)
Gaspra
Ida
Ida
If an asteroid impacts a planet or moon
        it is called a meteorite.

 The one mile wide Barringer Crater in
  Arizona was created by a 150 foot
  wide meteorite that impacted Earth
          50,000 years ago.

  Large impacts of meteors or comets
     can dramatically affect climate
     worldwide due to sunlight being
  blocked out for long periods of time.
Northern Namibia
Why is there no crater?

  Impact was at a low angle, much like
       skipping a rock on water.
A Meteorite “Fender-Bender”
In 1992 a 27 pound meteorite
smashed into this car.
 Comet West (1976)

 COMET:
A mass of frozen gases, dust,
and rock particles that often
 develop a bright tail when it
    passes near the sun.
Comet Hyakutake (1996)



                   tail


            coma

  nucleus
  A comets tail
  always points
 away from the
sun due to solar
     winds.
 Sometimes the
 tail will be out
 in front of the
  comet as it’s
traveling around
     the sun.
Comet Neat
Ikeya-Zhang
What happens to the size
of a comet each time it
  passes by the sun?
It gets smaller in size as it
  melts and forms a tail.
Halley’s Comet (The last time
Halley’s Comet was seen was in
 1986. It is due back again
         around 2062.)
Comet Hale-Bopp on March 8, 1997
      REVIEW
ASTEROID = Chunk of rock in space
               that orbits sun.


METEOR = Asteroid that has entered a
            planets atmosphere.

METEORITE = Meteor that has
                 impacted a planet.
  What is a
shooting star?
   A meteor burning
       up in our
     atmosphere.

				
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posted:5/10/2013
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