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We will learn about the 1973 launch window: USSR launched 4 missions (2 orbiters and 2 flybys with landers; Mars 4 (failed orbital turned into flyby), Mars 5 (orbiter), Mars 6 (flyby), Mars 7 (flyby).

Previous video in this series can be seen at:
https://youtu.be/c-7JDbYcBu4
Next video in this series can be seen at:
https://youtu.be/7Yo63c1Byrs