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Microscopic “Timers” Reveal Likely Source of Galactic Space Radiation

Microscopic “Timers” Reveal Likely Source of Galactic Space Radiation

04.21.16 – Most of the cosmic rays that we detect at Earth originated relatively recently in nearby clusters of massive stars, according to new results from NASA's Advanced Composition Explorer (ACE) spacecraft. ACE allowed the research team to determine the source of these cosmic rays by making the first observations of a very rare type of cosmic ray that acts like a tiny timer, limiting the distance the source can be from Earth.

“Before the ACE observations, we didn't know if this radiation was created a long time ago and far, far away, or relatively recently and nearby,” said Eric Christian of NASA's Goddard Space Flight Center in Greenbelt, Maryland. Christian is co-author of a paper on this research published April 21 in Science.

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