Stars Crossword

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Across
  1. 3. A _________ is when a heavy star explodes.
  2. 4. Large clusters of stars that orbit galaxies above and below their centers are known as ________ clusters.
  3. 5. When one star passes across another, it is known as an _______.
  4. 7. A ______ is a place where stars are born.
  5. 9. A star system where two or more stars orbit a center of mass is called a ______ star system.
  6. 10. ____ supergiants -- type O stars -- are the biggest, hottest, and brightest stars
Down
  1. 1. ________ stars appear to gradually change in brightness.
  2. 2. The common center of mass that a binary star orbits is known as the __________.
  3. 6. The closest star to earth is the ___.
  4. 8. After lower mass stars die, they become _____ dwarfs.