Light Gets Even Lighter: A New Upper Limit for the Photon’s Mass ⚡ экспресс
Original: "Photon rest mass from localized fast radio bursts with improved distribution of dispersion measure from extragalactic gas"
Fast radio bursts helped measure the possible mass of light particles more precisely than ever.
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Does blue light travel faster than red? If the photon has mass, that’s exactly the case. Astronomers used cosmic radio bursts as a race of different-colored rays across half the Universe. Result: light is almost perfectly massless – a new record of lightness.
🎯 If the photon had such mass, then over the distance to the Andromeda Galaxy, the blue ray would be late to the finish by a trillionth of a second.