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Another source here: https://bigthink.com/surprising-science/astrophysicists-gamma-ray-jets-speed-of-light https://bigthink.com/surprising-science/astrophysicis

• gus_massa 7y ago
  You are using as the title the subtitle of the bigthink article, not the title of the research article that is the main URL. The problem is that it's between misleading and totally wrong: > bursts of gamma rays may exceed the speed of light They exec the speed of light in the medium around the source, not the speed of value in vacuum that is impossible. This is explained in the article but it's too late. It's better to forget to put that in the title to get a nice linkbait. More details: https://en.wikipedia.org/wiki/Cherenkov_radiation https://en.wikipedia.org/wiki/Cherenkov_radiation > and cause time-reversibility. It's just that when the wave goes from sub-luminal to super-luminal it creates some signal, and when it goes from super-luminal to sub-luminal it creates another signal, that looks like the other signal running backwards. It looks impressive, but it is another linkbait.