unit 3 ethan canada password is password

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