In the eastern reaches of Java, Indonesia, the Kawah Ijen volcano stuns the world with a spectacle of neon-blue flames lighting up its crater at night. While it appears as if the volcano is spewing ...

Rotating on its side, Uranus is made up mostly of icy materials and has a gaseous atmosphere, rings, and 27 known moons. Arguably, the planet’s most striking feature is its delicate blue color ...

New research shows that the free-living coral Cycloseris cyclolites migrates toward blue light using a pulsed inflation ...