In January, 2002, an object 0.3 km across passed within 800,000 km of Earth, only roughly twice the distance to the moon.
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Q21: Large amounts of _ blown into the
Q22: Most meteorites have a(n) _, a very
Q23: Astronomers believe that asteroids are remnants of
Q24: Comets are asteroids that have gradually gathered
Q25: A meteorite's coating is very different from
Q27: An asteroid had a grazing encounter with
Q28: A large portion of the _ layer,
Q29: The Chicxulub crater is thought to be
Q30: Iron meteorites make up 20% of all
Q31: Because meteorites travel faster than the speed
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