an ethereal spectacle sometimes appears in the sky—clouds that shimmer with a ghostly blue-white light. These mysterious night-shining clouds, or noctilucent clouds, seem almost otherworldly ...

Spanning approximately 220,000 light-years across, the Andromeda Galaxy is the largest galaxy of the Local Group, which also ...

Standing beneath the Milky Way has always been a beautiful sight, if you were lucky enough to find dark skies on a dark night ... spiral arms of stars and dust clouds. Being able to take a ...

Light pollution—the needless shining of bright lights into the night sky—has robbed whole generations ... 911 to express alarm about strange clouds hovering overhead; they were seeing the ...

A rare cloud formation resembling waves in the sky has been seen across ... in Cawthorn on Tuesday night by a BBC weather watcher. Known as Kelvin-Helmholtz clouds, they form when a faster stream ...