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They have now published their results in a paper at Science Advances. Louis decided to take advantage of that fact in order to test a longstanding theory that light can also create conical waves. Researchers at Washington University in St. But light can go slower than its top speed when it moves through materials like glass. Theoretical physics tells us that nothing is faster than the speed of light. With light, creating a photonic sonic boom is a little more tricky. When they come together, they become a single ear-splitting shock wave known as a Mach cone. When these waves travel at such high speeds, they can't avoid each other. An object that breaks the sound barrier is pushing the surrounding air away and it creates pressure waves in front of and behind the object. The explosive sound that is normally associated with a sonic boom occurs when an object goes faster than the speed of sound. But the breakthrough with the most immediate potential may be the camera itself. Scientists have finally filmed what's known as a "sonic boom" being created by light.