Binary stars

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Across
  1. 3. part of a group of six stars
  2. 5. one of the brightest stars in our night sky
  3. 6. a system of two stars in which one star revolves around the other or both stars revolve around a common center of gravity
Down
  1. 1. Mizar is part of a group of six stars gravitationally bound together in a _______system
  2. 2. some binary stars revolve around a common center of______
  3. 4. binaries that are far enough apart that astronomers can distinguish them as separate stars by sight