But somewhere in humans' evolutionary history, that photoreceptor shifted more toward detecting violet than ultraviolet wavelengths. Perhaps we couldn't afford the damage to our eyes because we ...

Unlike a solar eclipse, you don’t need any protective gear to view a lunar eclipse safely because you’re staring at the moon, not the sun. You may want to bring binoculars or a telescope for a better ...

The colors change as the wavelength increases from violet to indigo to blue, green, yellow, orange, red and deep red. As a light wave's length increases, its energy decreases. This means the light ...

The signal is analysed by a latest-generation quad detector suited for violet wavelengths, providing the customer with five different analog optical signals. The complete board of signals includes ...