Yes, the red color seen in sunrises (and sunsets) is largely due to the fact that red light has the longest wavelength of visible light. During sunrise and sunset, the sun is lower on the horizon, and its light has to pass through more of Earth’s atmosphere to reach us. Shorter wavelengths, like blue and violet, are scattered by the atmosphere, while longer wavelengths, like red and orange, pass through more easily. This scattering effect, called Rayleigh scattering, is why we see the sky as red or orange during these times.