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We're now just past the midpoint of astronomical winter — that moment marking the midway point between December's winter solstice and March's vernal equinox. That moment took place at 4:11 p.m.

Taken over 16 minutes on January 17 the images show noctilucent or twilight clouds tinged with colour. This video has been ...

NASA’s Curiosity rover captured stunning images of Martian twilight clouds, revealing iridescent dry ice formations on Mars.

"I'll always remember the first time I saw those iridescent clouds and was sure at first it was some color artifact." ...