universe

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Across
  1. 3. member of a double star system
  2. 7. group of stars that form a pattern
  3. 9. band of colors formed when light passes through a prism
  4. 11. innermost layer of the sub's atmosphere
  5. 13. violent storm on the sun
  6. 15. apparent change in the position of a star
Down
  1. 1. force of attraction between objects
  2. 2. dark area on the sun's surface
  3. 4. imaginary line through the center of a body
  4. 5. outermost layer of the sun's atmosphere
  5. 6. has gravity stronger than light can overcome
  6. 8. quasi-stellar radio source
  7. 10. center of the sun
  8. 12. huge collection of stars
  9. 13. gives off radio waves
  10. 14. star that suddenly increases brightness