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Scientists have made their most accurate measurement yet of the mass of a mysterious neutrino particle. ... A neutrino is capable of passing through a light-year (about six trillion miles) of lead without hitting a single atom.


 neutrino physics astronomy cosmology
The oldest of the subatomic particles called neutrinos might each encompass a space larger than thousands of galaxies, new simulations suggest.


 neutrino physics cosmology size
The results of a high-profile Fermilab physics experiment involving a University of Michigan professor appear to confirm strange 20-year-old findings that poke holes in the standard model, suggesting the existence of a new elementary particle: a fourth flavor of neutrino.


 physics philosophy elementary particle neutrino symmetry antimatter
Neutrinos are among the fundamental building blocks of matter. They swarm all about us. The Sun, for example, releases them in huge quantities when it fuses hydrogen to make helium - the raw nuclear process at its core. They are, however, very difficult to study because they interact so weakly with normal matter. Hence, their nickname - "ghost particles". Nonetheless, scientists have been able to discern three flavours - electron...


 neutrino particle physics nuclear cosmology antimatter universe Big Bang
The collaboration behind the finding in September that neutrinos may travel faster than light has carried out an improved version of their experiment - and found the same result. If confirmed by other experiments, the find could undermine one of the basic principles of modern physics.


 physics light speed neutrino experiment particle
What might have been the biggest physics story of the past century may instead be down to a faulty connection.


 neutrino light speed measurement physics
An experiment to repeat a test of the speed of subatomic particles known as neutrinos has found that they do not travel faster than light.


 speed light neutrino experiment
The mystery surrounding the source of the highest-energy particles known in the Universe has grown deeper. The particles, known as cosmic rays, can show up with energies a million times higher than the biggest particle accelerators on Earth can produce. Astrophysicists believed that only two sources could make them: supermassive black holes in active galaxies, or so-called gamma ray bursts. A study in Nature has now all but ruled out gamma...


 gamma ray black hole particle energy universe galaxy cosmic ray neutrino