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

The Sun sets differently on Mars. Part of that is due to its distance from the star (an average of 142 million miles versus ...

Noctilucent clouds on Earth are something quite spectacular, thin structures so high that they can still catch sunlight long ...

The view shows a rocky hill with filmy, almost fog-like clouds above. These are noctilucent (night-shining ... It’s currently autumn—a perfect time of year for cloudspotting—where Curiosity ...