The best time to see noctilucent clouds is on clear nights between late May and mid-August, about 90 to 120 minutes after sunset or before sunrise. Sightings are most common during June and July.

P.M. EDT, marking the official beginning of summer for those in the Northern Hemisphere. On this date, the Sun is located ...

Fireflies need darkness to communicate. Males perform an airborne dance while flashing their abdominal lanterns in a pattern ...

Aurora chaser and photographer Harlan Thomas ( @TheAuroraGuy) was about 18.5 miles (30 kilometers) north of Calgary along a ...

You may see something astonishingly beautiful — noctilucent ("night shining") clouds. These high-altitude clouds, formed in the coldest place in Earth's atmosphere at the edge of space ...

The origins of noctilucent clouds are still mysterious. Unlike other spectacular night sky displays like aurora borealis, which have been observed for millenia, there are no reported sightings of ...

JACKSONVILLE, Fla. — Early risers across Northeast Florida were treated to an interesting sight Wednesday morning: wispy, glowing clouds in the eastern sky just before sunrise. These are known as ...

Residents of Belarus were able to observe noctilucent clouds in the night sky from 17 to 18 June. These clouds are a ...