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

Blue Ghost will spend the next 16 days in lunar orbit, if all goes to plan. It will conduct additional engine burns to circularize its path around Earth's nearest neighbor, then attempt a landing in ...

Curiosity rover images show iridescent clouds on Mars, helping scientists explore atmospheric and climate dynamics.

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What's new on the Sky HISTORY channel: ...