Crossword puzzle

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Across
  1. 6. make (an idea, situation, or problem) clear to someone by describing it in more detail or revealing relevant facts or ideas.
  2. 7. this person flies planes for a living
  3. 8. what its called when something explodes
  4. 9. you are a _______
  5. 11. thought of when people say UFOs
  6. 13. the bright blue thing when you look up
  7. 15. they twinkle in the sky
Down
  1. 1. when your with nobody else
  2. 2. makes looking at the stars easy
  3. 3. the physics of space
  4. 4. students make book _____
  5. 5. to look at something for a long while
  6. 10. known as the red planet
  7. 12. unidentified flying object
  8. 14. an obsession with something