Nilas is formed when loose ice crystals merge into fragile sheets across a still surface. But in this case, NASA's Earth Observatory says that unusual whirlpool currents were created by high winds ...

Many times, it is easy to trace a flight’s path in the sky, thanks to the wispy white lines that a plane leaves in its route, ...

Temperatures start out cooler in the 30s and 40s Wednesday morning. By Wednesday afternoon, cooler air is warmed by the ...

Regular Martian clouds are composed of water ice, but researchers believe that ... cause the carbon dioxide to condense into colorful, wispy clouds. Some plumes descend to 50 kilometers before ...