The Explorers' Club, № CMXXXII

Operation AXIOM: Destination Moon—The 51st Anniversary of Luna 20
14-25 February 1972: The Luna 20 probe lifted off from the Kazakh S.S.R.'s Baikonur Cosmodrome atop a Proton-K rocket; the probe landed on the Mare Fecunditatis—120 kilometers from Luna 16—collected soil samples, & sealed those samples inside an ascent stage, which lifted off from the Moon & landed back in the Kazakh S.S.R.; Luna 20 was the second Soviet lunar sample-return mission.

Commentary: Luna 20 returned thirty grams (30 g) of lunar soil samples, less than one-third of the mass of samples returned by Luna 16 in 1970. By contrast, Apollo 16, two months later in April 1972, returned almost ninety-six kilograms (95.7 kg, that's 95,700 g) of lunar samples.

Semper exploro.