Photos of the French Alps, Utah, the Maldives, Quebec, Australia and Argentina show the naturally occurring letters.

This false-color satellite photo from 2014 shows the immense heat emanating from lava lakes at the summits of a pair of ...

Australian forests are being transformed each night by the illumination of bioluminescent mushrooms. Photographer Khynan ...

The iconic Earthrise image of our planet rising above the lunar horizon, taken in 1968 by astronauts aboard the Apollo 8 mission, is widely credited with fueling the environmental movement that led to ...