ASSOCIATED PRESS The sky over Pluto may not be sunny but it's undoubtedly blue. NASA's New Horizons spacecraft discovered Pluto's blue sky during the historic flyby of the icy dwarf planet in July.

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. The so-called Blue Moon rose at dusk on Saturday, May 30, ...

Mars usually appears under a dusty red sky, but sunrise and sunset can reveal a strange blue glow. NASA rover images show how thin air, iron-rich dust, sunlight, and image processing create the planet ...