A video allegedly showing a cloud sinking from the sky in Indonesia is doing the rounds on social media.

The cloud in the upper left hand part of the image are from a barium release—with the purple-red ionized cloud oriented along the Earth’s magnetic field lines. The blue and white trail in the ...

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

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