WONDERS OF THE UNIVERSE

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Across
  1. 3. A celestial body moving in an orbit
  2. 6. Instrument used to see far away objects
  3. 8. A massive system of stars and gas
Down
  1. 1. The force that attracts a body toward earth
  2. 2. A giant cloud of dust and gas in space
  3. 4. The gas that humans need to breathe
  4. 5. A particle representing a quantum of light
  5. 7. Famous physicist known for relativity