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Cosmic rays traced to centers of star birth

By detecting gamma rays, a new generation of telescopes bolsters theory that supernovas are origin of some cosmic rays

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1:45pm, November 2, 2009

WASHINGTON, D.C. — Astronomers have for the first time traced gamma rays, the most energetic form of light, to galaxies undergoing a frenzy of star birth. The finding, which has revealed a new class of galactic gamma-ray sources, is not unexpected. But it provides new hints about the origin of many cosmic rays, the high-speed protons and other charged particles of extraordinarily high energies that bombard Earth.

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