Space

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Across
  1. 3. How many earths fit in the sun
  2. 4. space is completely
Down
  1. 1. How many times can neutron stars spin per second
  2. 2. How many degress celsius is the hottest planet
  3. 3. How old is the universe
  4. 4. What black hole is being located at the center of the milky way