Light blue. It conjures images of the sky shifting around dawn, of glimmering shallow seas, and of woodlands scattered with ...

Study participants wore trackers on their wrists to measure their activity levels and sleep patterns. We found that people exposed to more hours of blue light in the morning had better sleep and more ...

The shadow of the Blue Ghost spacecraft after it landed on the moon, with Earth in the distance. Blue Ghost just completed its mission, which lasted a full lunar day — two Earth weeks — on the near ...