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 ...

10 Night sky targets to celebrate International Dark Sky Week 2025; This mellow light blue may certainly seem familiar. Depending on where and at what time of the day you look at the sky, ...

In the pictures from last week, though, Earth can be seen glowing in a dark blue sky. It makes me think about scale. In the late 1960s, activists hungered for a “whole Earth” picture of our ...