A range of gorgeous skywatching targets are visible to the naked eye in city skies.

The night sky has been brightening faster than researchers realized, thanks to the use of artificial lights at night. A study of more than 50,000 observations of stars by citizen scientists reveals ...

Artificial light from major coastal cities can disrupt the nighttime biology of sharks, according to new research that provides the first-ever measurements of melatonin—a hormone tied to biological ...

Turning off the lights and closing the curtains isn't exactly a catchy, new sleep hygiene hack, but this common sense advice is gaining even more scientific credibility. Many Americans sleep in a room ...