A total lunar eclipse will make the moon appear red across the Western Hemisphere during the "Blood Worm Moon" this week.

In a total lunar eclipse, the entire Moon falls within the darkest part of Earth's shadow, called the umbra." During this phase, the moon turns a red-orange color due to Rayleigh scattering ...

The full moon, the period when the moon is at its largest and brightest, is merely one part of the lunar cycle, which is approximately one month in length ... through eight phases: new moon ...