As we’ve just mentioned, obsidian is often thought of as being dark and opaque, but it can actually come in a whole bunch of ...

Signs of mysterious rainbow-like patterns have been detected on a planet outside the solar system, astronomers have said. The phenomenon, named the glory effect, is often seen on Earth and has ...

A 2014 satellite photo of the Sivash region shows off the kaleidoscopic colors of a series of shallow, hypersaline lagoons — ...