High altitude cirrus clouds on a fine day in the Adirondacks. Photos by Katie Finch We talk about nature quite a bit at Audubon. But what is included in that broad category? Obviously plants and ...

Noctilucent, or "night-shining", clouds can be seen on Mars, just as they are on Earth. Nasa's Curiosity Mars rover imaged these high-altitude clouds on 17 May, 2019, using its navigation cameras.

On Wednesday, some high-altitude clouds covered much of the sky throughout the day, and lower-altitude clouds brought fully overcast skies by about 8 p.m., a National Weather Service spokesperson ...

Heading to the mountains? Learn how to avoid altitude sickness and make the most of your high-elevation adventure with these ...