Gyros and Gimbals, oh my! — The James Webb Space Telescope Reliability Lessons

First image from the James Webb Space Telescope — showing it pointed at a star with all mirrors aligned. (NASA)
Illustration of a simple three-axis gimbal set. The central disk does not move no matter how the entire complex rotates. (Wikipedia)
On the left, image of Apollo 16 Casper orbiting the Moon with Earth in the background. On the right, astronaut John Young on the Moon. (NASA)
Astronauts reaching into Hubble Space Telescope to replace gyroscopes in 2009 (NASA)

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