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Astronomy

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Cassini mosaic of Saturn

FOND FAREWELL  The Cassini spacecraft took this last look at the Saturn system two days before plunging into the giant planet’s atmosphere. 

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.

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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