Not so fast: Neutrinos’ speed downgraded


Four experiments showed that neutrinos don’t move faster than the speed of light, providing evidence that an earlier measurement was inaccurate, according to the institute in charge of the research project.

Measurements from experiments taken at a laboratory in Italy showed neutrinos traveled in a time consistent with the speed of light, the European Organization for Nuclear Research, or CERN, said Friday. CERN said in September that a neutrino beam was measured traveling faster than the speed of light, appearing to break the cosmic speed limit described by Albert Einstein in his theory of relativity. The finding was probably flawed because of a technical malfunction in timing instruments, CERN said Friday.

The organization said in September that it measured neutrinos, a type of subatomic particles, that were fired to a laboratory 450 miles away traveling at a velocity 20 parts per million above the speed of light.

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