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Across
  1. 1. a burning ball of gas
  2. 5. energy given off by the sun
  3. 7. what orbits the sun
  4. 8. visible radiation
  5. 9. planets orbit around this star
Down
  1. 1. the sun's rays as a source of energy
  2. 2. blue planet
  3. 3. the biggest planet
  4. 4. red planet
  5. 6. the farthest planet