Noctilucent clouds, Earth's highest clouds, shine blue in the twilight sky from late May to August in the northern hemisphere ...

Skywatchers were left surprised, puzzled and awestruck by a mysterious streak of light slicing through the night sky.

an ethereal spectacle sometimes appears in the sky—clouds that shimmer with a ghostly blue-white light. These mysterious night-shining clouds, or noctilucent clouds, seem almost otherworldly ...

At night, clouds trap heat, preventing it from escaping ... One of the most mesmerizing aspects of clouds is their constant ...

With no clouds and few lights ... and there are enough of them to brighten the night sky. It's a small step from annoyance to menace. While satellites offer many benefits, including environmental ...

A rather cool week is on the way. The coolness will be produced by rain showers, clouds and a cool northwest wind. If the sky ...

The Lyrid meteor shower is about to reach its peak activity for April. Here's when and how to see it, along with a cloud forecast.

To celebrate the 50th edition of The Sky at Night ... Saturn and its rings. On the night of the broadcast, heavy clouds made stargazing impossible, and the programme quickly descended into ...

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.