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Particle Physics

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HAWC experiment in Mexico

WATCHING LIKE A HAWC  The HAWC experiment near Puebla, Mexico, uses more than 300 tanks of water to detect the signatures of gamma rays. Its new observations have reignited a debate about the source of unexplained antimatter particles from space.

Pierre Auger Observatory

LYING IN WAIT  Huge tubs of water (one shown) at the Pierre Auger Observatory in Argentina reveal the tracks left as cosmic particles zip through them.

SDO image of sun

SPOT OF BOTHER  The same complicated sunspot spat out seven flares from September 4 to 10. This image shows in ultraviolet light the second-largest flare (bright flash at right), which was emitted on September 10.

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