This article does not cite any sources. (January 2014) (Learn how and when to remove this template message)
Kosmos 305 (Russian: Космос 305 meaning Cosmos 305) (Ye-8-5 series) was the fifth Soviet attempt at an unmanned lunar sample return. It was probably similar in design to the Luna 16 spacecraft. It was launched, on a Proton rocket, on October 22, 1969. The engines on the Block D upper stage failed, terminating the mission. This left the spacecraft stranded in Earth orbit.