Nocturnal animals tend to have proportionally bigger eyes than humans do. They also tend to have pupils that open more widely in low light. So, at the outset, nocturnal eyes gather more light than ...

A star in the beautiful constellation of Corona Borealis will explode before September, becoming visible to the naked eye in the northern hemisphere. NASA reports that T Coronae Borealis, a white ...

WE have shown 1 that the impression of brightness produced by a light ray which forms an image on a fixed area of the retina depends in high degree on the position of entry of the ray in the eye ...