Development of the Soviet N1 rocket, c 1965-1972.
© National Aeronautics & Space Administration / Science & Society
On the left is the early test variant of the Soviet N1 rocket as originally conceived in the mid-1960s. On the right is a slightly modified version designed in the early 1970s. The main external differences were in the fairing at the bottom of the first stage and the length of the vertical conduits on the first and second stages.