The iridescent cloud reveals new clues about ice formation in the Martian atmosphere (no little green men, sorry).

(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 ...

Standing beneath the Milky Way has always been a beautiful sight, if you were lucky enough to find dark skies on a dark night ... spiral arms of stars and dust clouds. Being able to take a ...