A halo of gamma-rays detected by the Fermi Space Telescope matches what would be expected if particles with masses around 500 times that of the proton are being annihilated near the Milky Way’s galactic center. A new study argues there is no known source for these gamma-rays, and their distribution is different from what we’d expect if their origins are in galactic light, not dark material. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Among the many theoretical objects that have been proposed to explain dark matter, WIMPs (weakly interacting massive particles) have long been a favorite. These would be subatomic particles that produce and are affected by gravitational fields, but not electromagnetism or nuclear forces. Because they

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