Space

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Across
  1. 4. The name of Uranus' finder
  2. 5. The study of celestial objects
  3. 8. (plural) The widely known title given to extraterrestrial life
Down
  1. 1. The shape of our moon
  2. 2. 'Father' of the solar system
  3. 3. Our home
  4. 6. The heart of our solar system
  5. 7. The closest planet to the sun