Solar System

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Across
  1. 1. the planet with a runaway greenhouse effect
  2. 4. the time it takes for a planet to fully rotate on its axis
  3. 6. the "red" planet between Jupiter and Earth
  4. 10. a planet made of rock
  5. 12. a collection of planets and smaller bodies orbiting a star
  6. 13. the path an object travels in space around another object
  7. 16. the time it takes for a planet to revolve around the sun
  8. 17. the closest planet to the sun
  9. 18. a large solid body made primarily of rock that orbits around a star
Down
  1. 2. an imperfect circle
  2. 3. a planet made primarily of gas
  3. 5. the largest planet in the solar system
  4. 7. the layer of gas around a planet
  5. 8. a gas giant with many rings
  6. 9. the furthest planet from the sun
  7. 11. a dwarf planet
  8. 14. the force that attracts objects with smaller mass to objects with larger mass
  9. 15. the planet between Saturn and Neptune