As soon as it gets dark, two bright lights become visible—the brightest in the southwest and an almost-as-bright light in the east. What are they?

In the photo from the space station, the comet is captured just above Earth’s horizon, which is illuminated by a bright light — also known as airglow — that occurs in the planet’s upper atmosphere ...

Whether you're wearing brown, blue or green lenses, this is how your sunglasses' color affects their performance.

Hers breaks down the winter blues, what causes them, and research-backed tips for handling this seasonal mood change.

Another display of the northern lights could be visible this weekend in several U.S. states following a severe solar storm.

If the dreary winter days have you feeling lethargic, the best light therapy lamps might be the perfect pick-me-up to tide ...

Living organisms enjoy sunlight—in fact, they need it to stay alive—but they tend to avoid light that is too bright. Animals go to their shelter, humans have a siesta, even plants have ...