{"id":6887,"date":"2018-07-17T16:50:42","date_gmt":"2018-07-17T20:50:42","guid":{"rendered":"http:\/\/www.monsffa.ca\/?p=6887"},"modified":"2018-07-17T16:50:42","modified_gmt":"2018-07-17T20:50:42","slug":"a-cosmic-particle-spewed-from-a-distant-galaxy-strikes-earth","status":"publish","type":"post","link":"https:\/\/www.monsffa.ca\/?p=6887","title":{"rendered":"A cosmic particle spewed from a distant galaxy strikes Earth"},"content":{"rendered":"
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A cosmic particle spewed from a distant galaxy strikes Earth<\/h4>\n
The rare detection of a high-energy neutrino hints at how these strange particles are created.<\/div>\n
By Michelle Hampson<\/a> \u00a0|\u00a0 Published: Thursday, July 12, 2018<\/div>\n
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This image combines a real photograph of the IceCube Lab in Antarctica with an artist’s rendering of the project’s sensors deep below the ice and the distant blazar from which a neutrino has been detected.\u00a0\u00a0 IceCube\/NSF<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/div>\n
Four billion years ago, an immense galaxy with a black hole at its heart spewed forth a jet of particles at nearly the speed of light. One of those particles, a neutrino that is just a fraction of the size of a regular atom, traversed across the universe on a collision course for Earth, finally striking the ice sheet of Antarctica last September. Coincidentally, a neutrino detector planted by scientists within the ice recorded the neutrino\u2019s charged interaction with the ice, which resulted in a blue flash of light lasting just a moment. The results are published today in the journal Science<\/em><\/a>.<\/p>\n

This detection marks the second time in history that scientists have pinpointed the origins of a neutrino from outside of our solar system. And it\u2019s the first time they\u2019ve confirmed that neutrinos are created in the supermassive black holes at the centers of galaxies \u2014 a somewhat unexpected source.<\/p>\n

Neutrinos are highly energetic particles that rarely ever interact with matter, passing through it as though it weren\u2019t even there. Determining the type of cosmological events that create these particles is critical for understanding the nature of the universe. But the only confirmed source of neutrinos, other than our Sun, is a supernova that was recorded in 1987<\/a>.<\/p>\n

Physicists have a number of theories about what sort of astronomical events may create neutrinos, with some suggesting that blazars could be a source. Blazars are massive galaxies with black holes at their center<\/a>, trying to suck in too much matter at once, causing jets of particles to be ejected outward at incredible speeds. Acting like the giant counterparts to terrestrial particle accelerators, blazar jets are believed to produce cosmic rays that can in turn create neutrinos.<\/div>\n

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