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Across
  1. 4. ___ cells; Devices that convert sunlight into energy, used to power spacecraft.
  2. 5. The first American satellite to successfully orbit Earth.
  3. 6. The first space station, launched by the Soviet Union in 1971.
  4. 7. A non-stick material used in spacecraft heat shields and spacesuits.
  5. 8. Aldrin; The second astronaut to walk on the moon.
  6. 10. invented to write in zero gravity and extreme conditions.
  7. 12. ____ Gagarin; The first human to orbit the Earth in 1961.
  8. 13. U.S. government agency created in 1958 to oversee space exploration.
  9. 14. The first animal in space, a dog launched by the Soviet Union.
Down
  1. 1. The spacecraft that carried the first human into space.
  2. 2. ____Tereshkova; The first woman to travel into space, in 1963.
  3. 3. ___ foam; A soft material developed by NASA to improve astronaut safety and comfort.
  4. 6. The world’s first artificial satellite, launched in 1957.
  5. 9. The mission that landed the first humans on the moon in 1969.
  6. 11. Armstrong; The first person to walk on the moon.