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@oconnor663 ("Jack O'Connor") retweeted:
@Erdayastronaut ("Everyday Astronaut") wrote:
THE ENTIRE SOVIET ROCKET ENGINE FAMILY TREE AND HISTORY IS HERE!!!!!! Join me for an hour an 34 minutes of rocket goodness. This is the ultimate guide to some of the most incredible engines with one of the most confusing histories!!! https://youtu.be/Y-xyXDiC92s