The elusive origins of long gamma-ray bursts may finally be revealed

Apr 15, 2020
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Could very short Gamma Ray bursts be the shock wave created by alien spacecraft exceeding the speed of light? Breaking the sound barrier causes a sonic boom. What would breaking the light barrier produce? A gamma ray boom?
 
Material objects cannot go faster than the speed of light in a vacuum. In a refractive medium they can go faster than the local speed and when they do they emit Cerenkov radiation. But their speed is still lower than the speed of light in a vacuum.