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This was the second attempt by the Soviet Union to send an advanced lunar sample return craft to the Moon, equipped with the capability to dig for a deeper core.

The first spacecraft (Luna 23) was damaged during landing on the Moon in October 1974. On this mission, the first three stages of the Proton-K launch vehicle worked without fault, but the Blok D stage, during its first burn for insertion into Earth orbit, failed.

The expensive payload burned up in Earth’s atmosphere without ever reaching Earth orbit.

Source

Siddiqi, Asif A. Beyond Earth: A Chronicle of Deep Space Exploration, 1958-2016. NASA History Program Office, 2018.

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