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At this point in 1973, the Soviets were attempting to fly 2 types of space station, the long duration orbital station scientific version called DOS. The other station was a military spy space station equipped with a machine gun, called Almaz or OPS which stood for orbital piloted station.
Salyut-2, OPS-1, Almaz
Mars 4 or 5
Mars 6 or 7
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Trouble began on the sixth day of the flight, November 17. The capsule developed an atmospheric leak, the pressure first dropping from 760 to 380 mm of Mercury. With the drop in cabin pressure all the animal test subjects died. It would have killed any Cosmonaut not wearing a spacesuit.
Proton-K with 7K-L1
Zone 6 mission profile
Zond 6 Double-dip reentry
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The first attempt for a Zond 4 follow-up launched on April 22. It failed when the Launch Escape System sent an erroneous abort command at T+260 seconds and shut down the Proton booster’s second stage. The escape rocket fired and pulled the descent module to safety.
Zond 5
Zond 5 Recovery Indian Ocean
Scientist observing lunar Tortoises
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When we left the Soviet Union they had somewhat successfully landed a probe on Venus and they had completed the automatic docking of two Soyuz 7K-OK spacecrafts. However they did not reach their goal of a circumlunar flight in time for the 50th anniversary of the glorious revolution.
L1 – Zond
Mishin, Agadzhanov, & Chertok
7K-L1 spacecraft on Proton booster
