The Solar System and More

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Across
  1. 3. Group of stars and gas
  2. 6. How much matter an object has
  3. 7. Planet named after the Roman god of the sea
  4. 8. When the moon passes in front of the Sun
  5. 11. A planet that has no atmosphere
  6. 12. The movement of a planet around the Sun
  7. 14. A natural satellite
  8. 18. The spinning of a planet on its axis
Down
  1. 1. Its color is cause by rusted iron on its soil
  2. 2. A small object orbiting the Sun and often glows with a long tail
  3. 4. An imaginary line that goes through the North and South poles
  4. 5. Also called a star
  5. 9. The gas giant with a red spot
  6. 10. The gaseous area surrounding a planet or other body
  7. 11. A shooting star
  8. 12. Usually made of icy objects or dust flying around a planet
  9. 13. The path the planets follow across the sky
  10. 15. We live on this planet
  11. 16. A band of rocks between Mars and Jupiter
  12. 17. A planet the spins backwards