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Across
  1. 3. Region where many asteroids orbit.
  2. 4. Icy body with glowing tails.
  3. 6. Cloud of comets beyond Pluto.
  4. 7. Very bright exploding meteor.
Down
  1. 1. Space rocks that lands on Earth.
  2. 2. Small rock in space before entering atmosphere.
  3. 4. Largest asteroid in main belt.
  4. 5. Streak of light in atmosphere.