Moon

NASA, Wikimedia Commons, Public Domain

Retired NASA astrophysicist Fred Espenak has 'written the book' on eclipses - many, many books, actually. He has seen 27 total solar eclipses and at least one on every continent. Matt Markgraf speaks with Espenak about why you should see the total eclipse, what it is, how to predict one and what kind of gear he's using to take photos of "The Great American Eclipse" on Monday.

The moon might be flowing with much more water than we thought, thanks to ancient volcanic deposits, a new study shows.

Many earthlings were treated to a rare sight last night, as a "supermoon" coincided with a lunar eclipse. It was a bad night to have clouds obscuring the view, as the last total eclipse that had these qualities occurred in 1982, and the next won't happen until 2033.

This lunar eclipse ticked many boxes for sky watchers: It was a supermoon, when the moon is both full and in perigee, or close to Earth, making it loom large in our sky. It was also a blood moon (the fourth and final lunar eclipse). And because it occurred days after the fall equinox, this was also the harvest moon.

The largest full moon of the year will grace the night sky Sunday as our nearest neighbor in space makes its closest approach.