Spaceship Earth - Science Unit Crossword

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Across
  1. 1. The seventh farthest planet in our solar system.
  2. 7. The name of the second Mars rover. Nicknamed "Oppy"
  3. 9. The distance from a star where a planet could have liquid water.
  4. 14. A group of stars that make up an image.
Down
  1. 2. A planet outside of our solar system.
  2. 3. The name for a scientist who studies space.
  3. 4. A clock that uses shadows to tell time.
  4. 5. A burning sphere of energy out in space.
  5. 6. An invisible force that keeps us on Earth.
  6. 8. This dwarf planet takes 284 years to orbit our sun.
  7. 10. A rotation around a star or planet.
  8. 11. The center of our solar system.
  9. 12. The center of Earth's rotation. It is diagonal.
  10. 13. A planet made up of mostly heavy gasses.
  11. 15. The third farthest planet in our solar system.