NASA’s Curiosity rover is skygazing and photographing lovely examples of noctilucent clouds on Mars. The wispy formations ...

This striking astronaut photo shows one of Russia's deepest lakes sandwiched between two halves of a volcano as its surface was transformed into a reflective sea of swirling clouds thanks to a ...

On the morning of Nov. 8, as dawn broke over the city, a sea of clouds rose around the castle, at times reaching as high as the main keep. According to city officials, this rare phenomenon can be ...