Wednesday night's supermoon, officially called the Super Worm Moon, was the last supermoon of the year. The full moon fell on the Vernal Equinox, the first day of spring in the Northern Hemisphere.
The March 20 moon was the third of three back-to-back supermoons, February's being the biggest and brightest moon of 2019.
According to Space.com, a supermoon is when a full moon coincides with the moon's perigee, or closest approach to Earth in orbit. Since the moon's orbit is elliptical rather than circular, its distance from the Earth varies.