Why does the sky change colors at night?

The sky changes colors at night primarily due to the scattering of light and the presence of atmospheric particles. During sunset and sunrise, shorter wavelengths of light (blue and violet) are scattered out, leaving longer wavelengths (reds and Oranges) to dominate. As night falls, the absence of direct sunlight allows for the visibility of stars and celestial objects, which can create a range of colors depending on atmospheric conditions, pollution, and the moon's position. Additionally, artificial lights from urban areas can contribute to a phenomenon known as light pollution, further altering the sky's appearance.