Space

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Across
  1. 1. First artificial satellite (launched by USSR)
  2. 4. Force that keeps planets in orbit
  3. 5. To send a spacecraft into space
  4. 6. The "Red Planet"
  5. 8. Moon mission program of the 1960s-70s
  6. 10. The universe seen as a well-ordered whole
  7. 11. Robotic vehicle traveling to other planets
  8. 12. First name of the first man to walk on the moon
  9. 13. Massive system of stars, dust, and gas
Down
  1. 1. Planet with prominent rings
  2. 2. Instrument used to observe distant stars and planets
  3. 3. US agency for space missions
  4. 6. A detachable section of a spacecraft
  5. 7. Person trained to travel in space
  6. 9. Path followed by a satellite