A California startup wants to use giant orbiting mirrors to reflect sunlight onto Earth after dark. The first test satellite ...

Einstein’s claim that the speed of light is constant has survived more than a century of scrutiny—but scientists are still ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. It’s becoming increasingly difficult to see stars in the ...

Light plays an important role in many aspects of our lives, from our sleep cycles to mental health. If our bodies don’t get the proper light we need, it can cause a chemical change in the brain that ...

Light is part of various disciplines, shaping the world as we know it. In physics, it serves as a measure of speed and makes vision, and the recording of images by the eye and camera lens possible.