Boomer crossword puzzle

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Across
  1. 3. The name of the 1st satellite in space
  2. 4. The exact isotope of uranium that little boy used
  3. 6. The method that early nuclear wepons used to explode
  4. 8. The program name that sent astronauts to the moon
  5. 9. The tv program that shows old sitcoms
Down
  1. 1. The first time the world almost ended
  2. 2. the year that the space race officially began
  3. 4. One of the U.S. major enemies
  4. 5. One of the cities in Japan that suffered an atomic bombing
  5. 7. Modern politicians' source of wisdom