Unit 3 Vocabulary

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