In 2013, the annual Orionid meteor shower is expected to rain down its greatest number of meteors before dawn on October 21. The previous morning (October 20) might feature meteors, too. There’s just one caveat for this year’s Orionid meteor shower, but it’s a big one: the moon. Full moon comes on October 18, 2013. That means there will be a bright moon in the sky during the morning hours, at the Orionids’ peak this year. Follow the links below to learn more about this year’s Orionid meteor shower.