Kosmos 305 (
Russian: Космос 305 meaning Cosmos 305) (Ye-8-5 series) was the fifth Soviet attempt at an uncrewed
lunarsample return. It was probably similar in design to the
Luna 16 spacecraft. It was launched, on a
Proton rocket, on October 22, 1969.[1] The engines on the Block D upper stage failed, terminating the mission. This left the spacecraft stranded in Earth orbit. It re-entered within one orbit.[2]
^Siddiqi, Asif A. (2018).
"Kosmos 305 [Luna]"(PDF). Beyond Earth: A Chronicle of Deep Space Exploration, 1958-2016. NASA History Program Office: 92. Retrieved February 23, 2023.
Payloads are separated by bullets ( · ), launches by pipes ( | ). Crewed flights are indicated in underline. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in (brackets).
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