Discover what to expect, how to observe the eclipse, and why the Moon turns red during the event.

“The occurrences are inferred from concentrations of elements sensitive to atmospheric oxygen levels in the geologic record.” The History of Air Earth’s atmosphere has had an abundance of oxygen for ...

As such, the term Earthshine is sometimes referred to as "The old moon in the new moon's arms." The glow is produced by light from a fully illuminated Earth reflecting off the lunar surface.