DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Soyuz rocket nozzles. This Soviet and later Russian launcher, part of the R7 family of rockets, was introduced in 1966, and many variants have been developed since. The Soyuz is the most-used rocket in the world, and has flown more than 1700 times. Its longevity is due to a reliable, basic and low-cost design.
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