This causes the cloud to take on the shape of rolling waves. Called Kelvin Helmholtz clouds, or just wave clouds, these clouds are a sign of turbulence in the air. The cloud’s name comes from ...

Scientists have searched for signs of water on Mars for decades, piecing together evidence from dried riverbeds, polar ice caps, and mineral deposits. Now, six months after they uncovered evidence ...

It's what we call a high pitched wave. And some of the waves are long, loose rolling waves, like this. A drum with a loose skin makes this sort of wave. It's what we call a low pitched wave.