Space

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Across
  1. 3. Star wars calls it a unit of time but is actually a unit of distance
  2. 5. name of the belt of asteroids beyond Neptune
  3. 6. First scientist to claim that the earth was not the centre of the universe
  4. 7. Inventor of the modern telescope
Down
  1. 1. First civilization to have studied astronomy
  2. 2. closest galaxy to the Milky Way
  3. 4. Brightest star in the night sky