Skywatchers are in for a rare treat tomorrow in the form of a blue moon.
Of course, a blue moon isn't actually blue. That's just the term used to describe the moon when it's full for the second time in a single calendar month--in this case July.
The month's first full moon occurred on July 2. Its second occurs officially at 6:43 a.m. EDT tomorrow, according to the U.S. Naval Observatory. If you don't want to get up early, Slooh Space Camera will live-stream the moon at 8:30 p.m. EDT.
In a typical year, there are 12 full moons--one every 29.5 days or so. But this year there are 13 (including tomorrow's blue moon).
Send us your photos of the blue moon by tweeting us at @HuffPostScience or use the hashtag #HPBlueMoon. We'll be collecting user photos from all over the world and yours just may appear on HuffPost Science!
How did Earth get its moon in the first place? Check out the "Talk Nerdy To Me" episode below to find out.