The largest and most biodiverse in the southern Atlantic Ocean—is nearly twice as vast as previously thought.

WELLINGTON, New Zealand — Marine scientists surveying a large undersea mountain chain were amazed to find millions of tiny starfish swirling their arms to capture...

Humans are actively destroying the coral reef ecosystems on Earth. Reefs are being overfished, bombed and poisoned, filled by sediment, and choked by algae growing on...