Star-gazers are awaiting the phenomenon known as the "supermoon" -- an unusually large and bright moon when its orbit point is closest to the earth.

NASA Scientist Dr. Noah Petro says it'll be a one of a kind moon - not to be confused with others.

"Recently, there's been this misidentification of other full moons as supermoons, this is THE supermoon, this is the largest moon of the calendar year. The full moon that occurred in July and the full moon that will occur in September as also going to be large, but not as large as this one, so they've been called supermoons, although by the strict definition there's only one per year. They're sort of quasi-supermoons, or super-ish moons, but this is THE supermoon."

Experts say the moon will be at its closest proximity to earth tomorrow.

Several countries currently have lunar missions underway, like NASA's Lunar Reconnaissance Orbiter.

NASA says the missions are allowing scientists to learn more about the entire solar system. And, of course, the moon