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Across
  1. 4. the star at the center of the solar system
  2. 5. a chemical element with an atomic number of 8
  3. 7. the sixth planet from the sun
  4. 9. we live on it
Down
  1. 1. the "milky way"
  2. 2. dwarf planet
  3. 3. 8 of these in our solar system
  4. 4. what shines in the sky at night
  5. 6. a state of matter that has no fixed shape or volume
  6. 8. sometimes called a "minor planet"