crossword science

123456789101112131415
Across
  1. 3. a star that suddenly increases greatly.
  2. 5. a cloud of gas and dust in outer space.
  3. 6. a system of two stars.
  4. 10. is the name for the observation in physical cosmology.
  5. 11. a celestial object.
  6. 12. the measure of intrinsic brightness.
  7. 15. a star showing a sudden large increase in brightness.
Down
  1. 1. a very large star that is even brighter than a giant.
  2. 2. a contracting mass of gas.
  3. 4. is a specific area of the celestial.
  4. 7. is a stellar remnant.
  5. 8. a group of similar things or people.
  6. 9. a very large star of high luminosity.
  7. 13. the distance that light travels in one year.
  8. 14. a system of millions or billions of stars.