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A galactic ‘comet’ called Terzan 5 just illuminated a 100-year-old puzzle about cosmic rays

  • Written by Mark Krumholz, Professor, Research School of Astronomy and Astrophysics, Australian National University
A galactic ‘comet’ called Terzan 5 just illuminated a 100-year-old puzzle about cosmic raysThe star cluster Terzan 5.ESA / Hubble, CC BY

When my colleagues and I set to work on a century-old cosmic mystery, we found an unexpected celestial laboratory in Terzan 5, a dense star cluster currently plunging through our galaxy at breakneck speed.

This stellar oddity has allowed us to study the behaviour of cosmic rays – high-energy...

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