space exploration in the 1960s:

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Across
  1. 3. - First U.S. human spaceflight program.
  2. 6. - Extravehicular activity.
  3. 8. - U.S. space explorer.
  4. 10. - Moon-landing program.
  5. 11. - Path of a celestial body.
  6. 13. - Launch of a spacecraft.
  7. 14. - First artificial satellite.
Down
  1. 1. - Soviet spacecraft series.
  2. 2. - Instrument for celestial observation.
  3. 3. - Red planet of interest.
  4. 4. - First human in space.
  5. 5. - Pertaining to the moon.
  6. 7. - Russian space explorer.
  7. 9. - Spacecraft propulsion device.
  8. 12. - Program that prepared for Apollo missions.