On a tranquil summer evening, just as the sun dips below the horizon and darkness begins to settle, an ethereal spectacle ...

Friday in D.C. occupied a special spot between May Day and Derby Day, and seemed to rise to the atmospheric occasion. It provided the benevolent warmth of near-summer, while showing off a sky full of ...

At these heights, the atmosphere is cold enough that clouds are typically composed of ice crystals, not water droplets. These clouds often look thin, wispy, and delicate—but they can provide valuable ...

The cloud, named Eos, is chock-full of molecular hydrogen and possibly rife with star-forming potential in the future.

"Just as blue sunlight scatters in the Earth's atmosphere and makes the sun look slightly less blue, light from a strong blue, rich white street light enters your eyeball, scatters around in your ...