Space

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Across
  1. 3. A person who is trained to travel in a spacecraft.
  2. 4. The accidental transfer of microbes between two planetary biomes.
  3. 7. The private aerospace manufacturer aiming to reduce space transportation costs.
  4. 8. The emission of energy as electromagnetic waves which can be harmful to DNA.
  5. 9. A long and often difficult process of personal or physical travel.
Down
  1. 1. The action of traveling in or through an unfamiliar area in order to learn about it
  2. 2. (2 words) A large artificial satellite used as a long-term base for observatory work.
  3. 5. A cylindrical projectile that can be propelled to a great height or distance.
  4. 6. The gravitationally curved trajectory of an object.