puzzle

1234567891011
Across
  1. 2. the first stage of a star
  2. 6. any star that has a hot, dense core which fuses hydrogen into helium to produce energy
  3. 8. shows how temperature and brightness relate
  4. 10. what is being contained by a universe
  5. 11. brightness
Down
  1. 1. class from which other classes are derived or inherited
  2. 3. a dying star
  3. 4. what contains a galaxy
  4. 5. in the shape of a plate or frisbee
  5. 7. most massive and most luminous stars
  6. 9. our galaxy