The Luna 5 reference article from the English Wikipedia on 24-Jul-2004
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Luna 5

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Luna 5 was an unmanned space mission of the Luna program, also called Lunik 5. It was designed to continue investigations of a lunar soft landing. The retrorocket system failed, and the spacecraft impacted the lunar surface at the Sea of Clouds.

Preceded by :
Luna 4
Luna program Followed by :
Luna 6