Sky-watchers in the Northern Hemisphere are reporting nightly outbursts of glowing tendrils in the twilight skies—a sign that noctilucent, or night-shining, clouds are soon to appear. Here's how to get the best view.
Sky-watchers in the Northern Hemisphere are reporting nightly outbursts of glowing tendrils in the twilight skies—a sign that noctilucent, or night-shining, clouds are soon to appear. Here's how to get the best view.