A red starfish is floating gracefully within a vibrant, blue underwater scene, surrounded by dark rocks and green seaweed.

Before walking on the moon, future astronauts may go for a swim. The famed Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center in Houston has trained hundreds of spacewalkers since 1992 ...

From a ballet of whitetip reef sharks to a male cardinal fish releasing freshly-hatched babies from its mouth, these winning underwater photos are a revelation of our oceans’ wonders. "Synchronicity," ...