Earth and Space Crossword Puzzle by Xiwen Hou

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Across
  1. 2. the farthest planet from the sun in the solar system
  2. 4. a natural display of lights, also called northern/ southern lights
  3. 5. the sun and all the planets and their moons,asteroids and comets that orbit around it
  4. 7. seven visible rings surround this planet
  5. 9. the final stage of a small star
  6. 10. a unit of length that represents about 9 trillion km
  7. 12. nothing can escape from this region due to the gravitational strength
Down
  1. 1. meteoroids that reach Earth's surface
  2. 3. the only planet with two moons
  3. 6. the death/explosion of a medium star
  4. 7. when the moon covers the sun (partially of fully)
  5. 8. an explanation of how the universe came to be
  6. 11. a vast group of stars, with gas and dust bounded together by gravity
  7. 13. cosmic balls made up of frozen gases, rocks and dust that can be found in the solar system