Moon Landing an Alternative

The LK was a lunar module (lunar lander designed for human spaceflight) developed in the 1960s as a part of several Soviet crewed lunar programs. Its role was analogous to the American Apollo Lunar Module (LM). Three LK modules, of the T2K variant, were flown without crew in Earth orbit, but no LK ever reached the Moon. The development of the N1 launch vehicle required for the lunar flight suffered setbacks (including several launch failures), and the first Moon landings were achieved by US astronauts on Apollo 11. As a result, having lost the Space Race, both the N1 and the LK programs were cancelled without any further development.

Sergei Korolev, the lead Soviet rocket engineer and spacecraft designer during the 1950s and 1960s, planned to adopt the same lunar orbit rendezvous concept as seen in the Apollo program. The lunar expedition spacecraft L3 was to consist of a Soyuz 7K-L3 Command Ship (a variant of the Soyuz) and an LK Lander. L3 would carry a two-man crew atop a single three-stage superheavy N-1 booster. A fourth stage, the Blok G, would push the L3 (LOK+LK) toward the Moon, with the Blok D as a fifth stage.