The first dazzling images have been released from the National Science Foundation and Department of Energy’s Vera C. Rubin ...

Noctilucent clouds, often called “night-shining clouds,” are the highest clouds in Earth’s atmosphere. They form in the mesosphere, about 76 to 85 kilometers (47 to 53 miles) above the ...

This month's night sky is filled with close-range meteors, swirling nebulas, and prime stargazing conditions. Here’s when you ...

Noctilucent clouds, Earth's highest clouds, shine blue in the twilight sky from late May to August in the northern hemisphere — and all you need are your naked eyes.

IN NATURE, June 28 (p. 196), Mr. Backhouse notes the appearance of illuminated clouds to northward at night. Similar clouds are seen from here on almost every clear night near the summer solstice.

'Space cloud' season is upon us. With a little luck, Brits might be able to spot spectacular noctilucent clouds in the evening sky. The rare night sky phenomenon is seasonal and becomes visible in ...

The night sky isn’t perfectly dark—instead it glows faintly, and the source isn’t exactly local. ... A decently dark site in a rural area has a sky background of about 21 mag/arcsec 2.