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Atom & Cosmos

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Arecibo observatory and radio telescope

A WELCOME REPRIEVE  Arecibo staff hold a Puerto Rican flag in front of the observatory’s main dish after Hurricane Maria. The observatory will remain open, the National Science Foundation announced November 16.

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.

colliding black holes

BLACK HOLE BOUNTY  Gravitational waves have been spotted from two merging black holes (illustrated above), the fifth reported detection.

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