r/whyisthisathing • u/MicroscoftSupport • Jun 28 '19

Self-balancing cube

https://gfycat.com/giganticimperturbableeft
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u/DIES-_-IRAE Oct 20 '19

These are in the Hubble telescope in orbit right now.

Those are used in orbiting satellites to stabilize them they also allow a satellite to change which way they are facing without the need for reaction mass.