Martian clouds are almost always made of dry ice, or frozen carbon dioxide. 95% of the planet's atmosphere is CO2.

(When a massive power outage struck southern California in the 1990s, Los Angeles residents reportedly called 911 to express alarm about strange clouds ... preserve the dark night sky.

The view shows a rocky hill with filmy, almost fog-like clouds above. These are noctilucent (night-shining) clouds. “Even though the sun has set in Gale Crater, the clouds are high enough in the ...

We have developed a method using contour finding and convolution neural networks (CNNs) to search for Infrared Dark Clouds (IRDCs) in the Spitzer Galactic plane survey data. IRDCs can vary in size, ...