Not all meteor showers are created equal. Some are cosmic nor’easters; some are mere drizzles. This year’s edition of the Leonid meteor shower, beginning Nov. 17, will, alas, be more of the latter—and there’s a simple cosmic explanation for that.
The annual sky show is the work of Comet Tempel-Tuttle, which makes a single loop through the solar system once every 33.5 years, leaving a trail of dust and other debris in its path. Once a year, Earth moves through that wake, and the cometary bits streaking through the atmosphere are what we see as a meteor shower. When the comet passed by recently, the debris trail is denser and the fireworks are greater.
That was the case in 1966, when tens of thousands of meteors rained down per hour. Things were a little spottier, but still still pretty exciting from 1999 to 2002, when there were thousands of flashes every hour. And now? Expect no more than 10 to 15, since Tempel-Tuttle is at its greatest distance from the sun—about 1.8 billion mi (2.9 billion km) away.
Still, if you’ll take whatever meteors you can get, peak viewing times in North America will be from midnight to dawn on the nights of Nov. 17 and Nov. 18. Look in the direction of the constellation Leo—which is how the shower got its name. A NASA livestream, beginning at 7:30 PM EST on the 17th will also be tracking things as they happen—or in this quiet year, kind of don’t happen.