Cloud Composition Clouds are a fascinating part of our sky, made up of countless tiny water droplets or ice crystals. When ...

They were still largely a mystery to scientists until about 20 years ago, when NASA's Aeronomy of Ice in the Mesosphere mission studied them. Researchers learned that the clouds form when ice ...

which rise into the sky and spur clouds to rain down even more water to nurture life below. Even if microbes don’t ascend to the mesosphere, getting 25 miles into the air is an impressive feat.