Our Solar System

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Across
  1. 5. The time it takes for a planet to make one full rotation.
  2. 8. The half of Earth above the equator.
  3. 9. The four planets closest to the Sun.
  4. 10. The first day of summer.
  5. 12. The layers of gas surrounding a planet, moon or Sun.
  6. 13. The force of attraction between all objects in the universe.
  7. 15. The distance north or south of the equator.
Down
  1. 1. The four gaseous planets farthest from the Sun.
  2. 2. An invisible line dividing Earth into hemispheres.
  3. 3. The half of Earth below the equator.
  4. 4. The distance across the center of a planet.
  5. 6. An invisible line around which a planet rotates.
  6. 7. The first day of winter.
  7. 11. The path of a moon around a planet or a planet around the Sun.
  8. 12. A person who travels into space.
  9. 14. The time it takes for a planet to make one full revolution around the Sun.