Tracing the origin of a single neutrino

ack

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Al M.

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ack

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Good point, but at the same time, in the fields of cosmology, astrophysics and such, we are often not entirely certain. Case in point, we are still attempting to prove Einstein right about his equivalence principle - last, as of last month.
 

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From https://phys.org/news/2018-07-century-old-riddle-resolveda-blazar-source.html

Equipped with a nearly real-time alert system—triggered when a very high-energy neutrino collides with an atomic nucleus in the Antarctic ice in or near the IceCube detector—the observatory broadcast coordinates of the Sept. 22 neutrino alert to telescopes worldwide for follow-up observations. Gamma-ray observatories, including NASA's orbiting Fermi Gamma-ray Space Telescope and the Major Atmospheric Gamma Imaging Cherenkov Telescope, or MAGIC, in the Canary Islands, detected a flare of high-energy gamma rays associated with TXS 0506+056, a convergence of observations that convincingly implicated the blazar as the most likely source.

These observations prove that TXS 056+056 is one of the most luminous sources in the known universe and, thus, add support to a multimessenger observation of a cosmic engine powerful enough to accelerate high-energy cosmic rays and produce the associated neutrinos. Only one of these neutrinos, out of many millions that sailed through Antarctica's ice, was detected by IceCube on Sept. 22.

Bolstering these observations are coincident measurements from other instruments, including optical, radio, and X-ray telescopes. "The ability to globally marshal telescopes to make a discovery using a variety of wavelengths in cooperation with a neutrino detector like IceCube marks a milestone in what scientists call multimessenger astronomy," says Halzen.
 

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