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

Snow is made up of trillions of tiny ice crystals to make snowflakes, with not one alike. Here's how they form.

There's no better time than Valentine's Day to let someone know how you feel about them. And there's no better way to do that ...

NASA’s Curiosity rover observed a feather-shaped iridescent cloud, offering insights into Martian atmospheric conditions.