Packing for mars

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Across
  1. 3. astronauts try to go explore this
  2. 6. large groups of companies
  3. 9. something alien-y
  4. 10. silly behavior
Down
  1. 1. people sent to space
  2. 2. home to humans
  3. 4. unable to describe in words
  4. 5. something sent to space
  5. 7. a planet
  6. 8. a space team