Astronomy

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Across
  1. 3. all of the existing matter and energy in space
  2. 5. a group of stars
  3. 7. oval-shaped path an object follows
  4. 8. an imaginary line through the center
Down
  1. 1. phase change in the moon’s appearance from Earth
  2. 2. a collection of solar systems
  3. 4. the moon’s shadow blocks sun’s light
  4. 6. System a system of objects in space