January 8th, 1973 saw the launch of Luna 21 from Baikonur, onboard a Proton 8K82K rocket, to land the Lunokhod 2 rover on the Moon a week later, on January 15th. The mission was successful, with a landing in the Le Monnier crater, between the Mare Serenitatis and the Taurus mountains.
Lunokhod 2 took some 80,000 photographs, and conducted several soil surveys. It kept going until May 1973, when dust on its solar panels and radiators caused a terminal heating issue. TAS announced the end of the mission on June 3rd.