6.3 Stars & Galaxies Crossword

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Across
  1. 4. a way to determine the distance to nearby stars and other objects
  2. 5. groups of two or more stars
Down
  1. 1. system of two stars that are gravitationally bound to and in orbit around each other
  2. 2. a group of single stars, star systems, star clusters, dust and gas bound together by gravity
  3. 3. active, young galaxies with black holes at their glowing centers
  4. 6. a planet revolving around a star outside our own solar system