A "red moon" is often referred to as a lunar eclipse. During a lunar eclipse, the Earth comes between the Sun and the Moon, casting a shadow on the Moon and causing it to take on a reddish tint. This is because of the way that sunlight passes through the Earth's atmosphere and is bent, or refracted, in a way that causes the red light to be filtered and directed towards the Moon. As a result, a red moon is sometimes called a "blood moon."
3d cartoon