Do you know why the sky sometimes turns red at sunset? The phenomenon comes from a process called scattering. During the day, sunlight travels a shorter path through the atmosphere, scattering blue wavelengths and making the sky appear blue. But at sunset, sunlight passes through more atmosphere, scattering away blues and greens and leaving behind reds and oranges. Sailors once used this as a weather guide. Red sky at night, sailors delight. Red sky in morning, sailors warning. While it's not al