Have you ever wondered how clouds stay in the sky? Here's your answer, and by the way, the weight of an actual cloud might ...

Kelvin Helmholtz clouds are named after the two scientists who studied the physics behind them A rare cloud formation resembling waves in the sky has been seen across North Yorkshire. The billowy ...

Have you ever gazed up at the sky and seen clouds that resemble waves in an ocean? These aren't your everyday fluffy cumulus clouds or storm clouds. These are gravity wave clouds -- a fascinating ...