A total lunar eclipse will light up the night sky tonight, turning the moon a reddish hue. Here's how and when to view it.

Earth’s shadow will block most of the light that illuminates the lunar surface, creating what is known as a blood moon.

A total lunar eclipse occurs when the Earth, Moon, and Sun align, causing the Moon to pass into Earth’s shadow. Instead of disappearing, the Moon takes on a deep red or copper hue due to what’s called Rayleigh scattering —the same effect that creates red and orange sunrises and sunsets.