The Luna 7 reference article from the English Wikipedia on 24-Apr-2004
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Luna 7

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Luna 7 was an unmanned space mission of the Luna program, also called Lunik 7. The Luna 7 spacecraft was intended to achieve a soft landing on the Moon. However, due to premature retrofire and cutoff of the retrorockets, the spacecraft impacted the lunar surface in the Sea of Storms.

Preceded by :
Luna 6
Luna program Followed by :
Luna 8