What's known as the 'Strawberry Moon' first appeared Sunday night and will reach its full brightness on Tuesday.
Despite the name, the moon won't look exactly like a strawberry.
The name came from some Native Americans because the moon appears during strawberry harvest season.
Astronomers call it a 'supermoon' because it occurs when it orbits closest to the Earth.
That means the moon will appear about 17% larger and 15% brighter.