A strange, never-before-seen glow in the halo of our galaxy may be the strongest dark-matter breadcrumb yet.

A new analysis of 15 years' worth of data from the Fermi Gamma-Ray Space Telescope reveals a glow of unusually high-energy gamma rays that cannot easily be attributed to any known source.

According to astronomer Tomonori Totani of the University of Tokyo in Japan, it may be the radiation produced when hypothetical dark matter particles collide and wipe out one another.

It's not the first time astronomers have gone looking for such a glow – but it's the first time one has been found peaking at this specific energy level in the galactic halo , the large bubble of gas and radiation that surrounds the Milky Way.

Related: The Milky Way's Halo of Stars Isn't The Neat Sphere A

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