The fleeting glow of noctilucent clouds is once again making its appearance in Earth’s upper atmosphere, signaling the start ...

The clip posted by @verivanessa shows a large cloud at sunrise appearing to sit just above the horizon, with a long, dark rectangular beam stretching across an orange-pink sky. A note overlaid on ...

The blue-silver streaks shine brightly ... “They’re really remarkable to see,” said Deland. “The clouds really just shine against the dark sky.” This week, sky watchers in the upper ...

Clouds, which are plumes of condensed water vapor in the sky, come in many shapes ... is that producing that very dark blue is pretty difficult. Not impossible, but clouds are typically ...

But the behavior of these lab-based cloud particles mimics the behavior of cloud particles in massive sky-sweeping clouds, only in miniature. “Of course, we don’t grow them at quite the same scale you ...

Noctilucent clouds, silvery-blue tendrils that glow in the dark ... they’re able to catch the sun’s lingering light when the lower sky is dark, according to Gavin Pretor-Pinney, author ...