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No laws of physics were broken but light seems to have moved faster than its speed limit
SAKKMESTERKE/SCIENCE PHOTO LIBRARY
The speed of light may not necessarily be constant. Light travelling through a plasma can appear to move at speeds both slower and faster than what we refer to as “the speed of light” – 299,792,458 metres per second – without breaking any laws of physics.
Clément Goyon at Lawrence Livermore National Laboratory in California and his colleagues accomplished this using a pair of lasers fired into a jet of hydrogen and helium plasma. One laser beam, called …
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