Hidden figures

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Across
  1. 4. Racially separated
  2. 6. The name of the successful rocket
  3. 7. Someone that enters space
  4. 9. Empty, beyond the world
Down
  1. 1. Someone that does complicated math problems
  2. 2. Concealed,
  3. 3. The name of a failed rocket
  4. 5. Synonym for toilet
  5. 6. Things, shapes
  6. 8. A shuttle to send you to space