Gravity is the most familiar of the known forces, but it seems to be eternal and unchanging. However, scientists believe that gravity moves with a specific speed. In this video, Fermilab’s Dr. Don Lincoln describes a fascinating observation that definitively measures the speed of gravity.
Fermilab physics 101:
https://www.fnal.gov/pub/science/particle-physics-101/index.html
Fermilab home page:
https://fnal.gov
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