Space

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Across
  1. 3. What happens inside the sun(Two words)
  2. 5. The closest star to us (Not including the sun(two words))
  3. 6. Our galaxy(Three words)
Down
  1. 1. The biggest planet in the solar system
  2. 2. UFO stands for...(Three words)
  3. 4. The planet with giant rings