At any given time, about two-thirds of Earth's surface is covered by clouds. Overall, they make the planet much cooler than it would be without them. Subscribe to our newsletter for the latest ...

Add Yahoo as a preferred source to see more of our stories on Google. A red planet on the left; on the right are two graphs showing the brightness of clouds observed in Mars' atmosphere. An ...

The first journal article about clouds identified by participants of the Cloudspotting on Mars project has been accepted for publication and is now available online. The article, "The Cloudspotting on ...

Cloud patterns have been shifting over the past 30 years in ways that a new study says are possibly due to global warming––and may even lead to more warming in the future. Climate scientists believe ...