Asteroids, Meteors, Comets

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Across
  1. 3. An object's revolution around another object.
  2. 4. An asteroid that has entered Earth's gravitational force and is also in the atmosphere, in which it will fall and crash on Earth's surface.
  3. 6. A piece of rock "left over" from the formation of the solar system; it stays in orbit around the sun.
  4. 8. The galaxy that Earth is in.
  5. 10. The ____ is between Mars and Jupiter.
Down
  1. 1. A unit of measure used to measure astronomical distances; it is 92,955,807.3 miles.
  2. 2. The ____ is a belt of asteroids that is beyond Neptune, its diameter is approximately 100 AU.
  3. 5. The ____ is similar to the Kuiper and Asteroid Belts, but it is 50,000 AU away from the sun and the farthest reaches are 100,000 AU away from the sun.
  4. 7. A cosmic "snowball" made of ice, gas, rock, and dust, that has a "tail".
  5. 9. An asteroid that has entered Earth's gravitational force.
  6. 11. The center of the solar system, in which all planets, asteroids, etc. orbit it. It is the largest star in the solar system.
  7. 12. oval shaped