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Connecting dots in the sky

Scientists match up maps of matter and light.

known as unresolved gamma-ray background (yellow)
Astrophysicists have found a certain gamma-ray glow in the sky, known as unresolved gamma-ray background (yellow), coincides with cosmic regions that contain a lot of matter (red). Credit: Daniel Gruen/SLAC/Stanford, Chihway Chang/University of Chicago, Alex Drlica-Wagner/Fermilab