vocab crossword

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Across
  1. 2. giant, very large planets that have no solid surface their
  2. 4. when a meteor strikes earth
  3. 5. planet, the 4 planets closest to the sun
  4. 6. cloud, a cloud of millions of comets beyond Pluto
  5. 7. an object in space that emits energy in the form of light and heat
  6. 9. amount of matter in an object
Down
  1. 1. unit, the average distance between the earth and sun
  2. 3. planet, planets that are farthest from the sun
  3. 4. a meteoroid burning as it reaches earth.
  4. 8. an imaginary line that a planet rotates on.