Look to the skies on Sept. 7-8 to witness Earth's shadow roll over the lunar disk, giving rise to a deep red "blood moon." Here's what to expect during each phase of this week's total lunar eclipse.
A total lunar eclipse occurs when Earth passes between the moon and sun, temporarily bathing the entire lunar disk in its shadow. This in turn causes our natural satellite to glow a deep red, as the scattered light from every sunrise and sunset on Earth is bent onto the lunar disk.
