The largest survey of exoplanets using an observatory atop Maunakea on the Big Island confirms a long-predicted relationship between planetary mass and rotation — putting a new spin on planet ...

Distinguishing between brown dwarfs and giant planets has confused astronomers, but a clear separating factor has finally ...

Discover how light travels at 300,000 km/s by orbiting planets multiple times per second. This comparison reveals the astonishing speed of light as it races around planets from Pluto to Jupiter.

A lava world reaching 3,200°F still holds an atmosphere, challenging what scientists thought extreme planets could survive.