Kosmos 300

Kosmos 300 was the fourth Soviet attempt at an uncrewed lunar sample return. It was probably similar in design to the later Luna 16 spacecraft. It was launched, on a Proton rocket, on September 23, 1969. The mission was a failure. The engines on the Block D upper stage failed due to an oxidizer leak, leaving the spacecraft to burn up in Earth's atmosphere.

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Type	Subtype	Date	Description	Notes	Source
incident	incident		[[1]]		Wikidata