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Gamma-ray signals from the Milky Way's Cygnus superbubble (left) suggest that the star-forming region may be a source of cosmic rays. Higher-energy cosmic rays may come from active galactic nuclei, as found in the galaxy Centaurus A (right). Credit: From left: IPAC and MSX/nasa; X-ray: NASA, CXC, R. Kraft et al/cfa, Radio: NSF, VLA, M. Hardcastle et al/U. Hertfordshire, Optical: ESO, M. Rejkuba et al/Garching

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