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 ...

At night, clouds trap heat, ... The tallest clouds in the sky are the mighty cumulonimbus clouds, which can stretch up to an astonishing 50,000 feet, or 15,240 meters, high.

They Glow After Sunset In The Northeastern Night Sky. Noctilucent clouds can only be seen at twilight, shining after sunset, but they are never guaranteed. Visible as vast, ...

Today marks the start of Northern Hemisphere summer, and also offers a chance to view night-glowing clouds if you’re lucky.

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

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

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.

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 ...

We were incredibly lucky that night in 1984, when I was seven, because a satellite came into view. With no clouds and few lights, it moved steadily like a bright little star across the dark, dark sky.

Of course the sky is dark at night.” But that answer is wrong or, at best, incomplete, and the actual situation wasn’t obvious even to eminent scientists a century or so ago.

A total lunar eclipse will flush the moon red Thursday night into Friday morning across the country including Boston, where viewers will have to hope for a break in the clouds to see the spectacle.