Astronomical summer begins tonight, June 20, at 10:42 p.m. Eastern Daylight Time — the moment of the June solstice. At that ...

Summer arrives for northern observers as the Moon visits Venus, Uranus, and Mercury. Plus: globular cluster M15, double star ...

The sky tells us a lot about what’s going to happen in weather. Last night’s sunset had a few strong hints as the chaotic sky developed. Sorry, I’m going to ...

And because blue wavelengths are the shortest, they get scattered more, resulting in a blue sky. During a sunset, however, light scattering works differently. The sun’s light has a lot further ...