Armstrong, Collins and Aldrin pose in front of their Saturn V rocket on May 20, 1969. Neil Armstrong, front, waves as the crew heads to the van that will take them to the rocket for launch at the ...

Why It Matters: The Saturn V was used in the Apollo programs in the 1960s and 1970s, weighed 6.2 million pounds, and generated 34.5 million newtons (7.6 million pounds) of thrust at launch.