Space

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Across
  1. 4. The birthplace of stars
  2. 6. Densest things in the universe
  3. 7. Fourth Planet of our solar system
  4. 8. The shape of the earth
  5. 9. Lastname of the first man in space
Down
  1. 1. Radius of the earth in metres
  2. 2. The travellers in the night sky
  3. 3. Phase of the moon on the 12th of May 1987
  4. 5. Scholar who discovered that orbits are elliptical