The light that bounces off these clouds passes through the ozone layer before it gets to our eyes. Ozone absorbs red light and allows blue light to pass through, which is why these clouds take on ...

Cloud computing and blue-sky thinking: An atmospheric scientist illuminates the science of clouds in Earth’s sky and beyond. Studying the physics and microphysics of cloud formation and behavior in ...

Electric-blue "night-shining" clouds can be seen swirling over the skyline of Nykøbing Mors in Denmark on July 1, 2016. (Image credit: Ruslan Merzlyakov/RMS photography) ...

Noctilucent clouds are like a great “geophysical light bulb.” News flash: The bulb is glowing! 1 weather alerts 1 closings/delays. Watch Now. 1 weather alerts 1 closings/delays. Menu.

Each year, Antarctica gets a visit from clouds that shine a brilliant, electric blue. These clouds, called noctilucent clouds, light up the sky during the summer time for the South Pole.

Night sky photographer Ruslan Merzlyakov captured bright blue-white noctilucent clouds dancing over Nykøbing Mors in Denmark just before dawn on July 1.