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. Publication information: Image under copyright by Peter Gorin. Image and caption from Challenge to Apollo: The Soviet Union and the Space Race, 1945- 1974 (NASA SP-2000-4408) by Asif A. Siddiqi. Please note that the image number assigned to this image is not an official NASA number. It is for GRIN database purposes only.

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