A blue sky is a good sky. It's a reassuring sight that promises clear weather and bright days. But what does it mean when the sky turns purple? While it's not uncommon to spot purple skies during ...

A panorama of dark skies over the desert landscape of the Spiti Valley, a high-altitude region in the Himalaya. Evidence is mounting that awe-inspiring visions like a dark sky at night is good for ...

The International Dark-Sky Association (IDA) is working to preserve the night sky. Here's a look at its 21 certified dark sky reserves around the world.

Maine's night skies, devoid of light pollution, provides some of the best skywatching in the continental United States, and a stunning palate for astrophotographer Mike Taylor.

The night sky isn’t perfectly dark—instead it glows faintly, and the source isn’t exactly local By Phil Plait edited by Lee Billings Zodiacal light over Padar Island, Indonesia.

This month, the park officially became the 100th International Dark Sky Park in the world and just the fourth in Colorado. (Other Colorado parks with the designation include Jackson Lake State Park, ...