science vocab 3

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