Andrew Buth's crossword puzzel

123456789101112
Across
  1. 7. spectrum all of the frequencies or wavelength of electromagnetic radiation
  2. 10. magnitude a measure of how bright a star would be if it were seen from a standard distance
  3. 11. magnitude the brightness of a star as seen from earth
  4. 12. a large cloud of gas and dust in interstellar space; a region where stars are born
Down
  1. 1. space and all matter and energy in it
  2. 2. the actual brightness of an object such as a star
  3. 3. hertzsprung-russel diagram a graph that shows the relationship between star's surface temperature and absolute magnitude
  4. 4. dwarf a small hot dim star that is left over an old sun like star
  5. 5. year the distance that light travels in a year; 9.46 trillion kilometers
  6. 6. a gigantic explosion in which a massive star collapse and throws its outer layers into space
  7. 8. a collection of stars, dust, and gas bound together by gravity
  8. 9. star a star that has collapsed under gravity to the point that electrons and protons have smashed together to form neutrons