Space Case by Stuart Gibbs

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Across
  1. 2. You live with them and love them
  2. 5. The planet we live on
  3. 7. You call and take pictures with them
  4. 8. They have shells and you crack them to cook them
  5. 10. Humans breathe it in
Down
  1. 1. A non-earth species
  2. 3. To kill someone
  3. 4. Earth's only natural satellite
  4. 6. A never ending black void
  5. 9. Something very very large