Scientists in the United States are reporting “unprecedented patterns” of surface warming, an ominous sign for coral.

© Jorge Silva/Reuters

Divers and marine biologists are getting a window into the lives of a red crustacean most often found in the guts of other species.

Sperm whales rattle off pulses of clicks while swimming together, raising the possibility that they’re communicating in a complex language.

An effort to protect 30 percent of land and waters would count some commercial fishing zones as conserved areas.

© Karsten Moran for The New York Times

Rising sea temperatures around the planet have caused a bleaching event that is expected to be the most extensive on record.

© Renata Ferrari/AIMS, via Reuters

There have been record temperatures every day for more than a year. Scientists are investigating what’s behind the extraordinary measurements.

The moon will drift far enough from Earth that it no longer fully obstructs the sun. But predicting when this will happen poses numerous challenges.

© Richie Pope