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Matter & Energy

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GAMMA GLUT  Extra gamma rays from the center of the Milky Way, detected by the Fermi Gamma-ray Space Telescope (shown), could be a sign of dark matter. But a new study doesn’t support that idea, finding that other parts of the galaxy also exhibit excess gamma rays.

March hydroxyl distribution

RADICAL THEORY  Changes in the concentration of a highly reactive compound in the atmosphere called hydroxyl may be to blame for a rise in global methane levels since 2007, new research suggests. Redder regions in this simulation of a typical March hydroxyl distribution contain higher concentrations of the molecule.

proton illustration

PROTON PUZZLES  Hidden secrets of the humble particle could have physicists rethinking some standard notions about matter and the universe.

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