“The Leonid meteor shower rolls through the sky once a year, peaking in mid-November. It’s caused by a trail of debris that travels along the orbit of the comet Tempel-Tuttle.The 2010 Leonid meteor shower runs from Wednesday, Nov. 10, through Sunday, Nov. 21. The peak will be the nights between the 17th and the 19th.The Leonids are famous for being spectacular storms — since the orbit of the Temple-Tuttle comet intersects with that of Earth, the debris cloud our planet passes through each year is dense and full of particles and meteoroids. In optimal viewing conditions on a good year, you can see between 15 and 30 meteors per hour streaking across the sky during the peak.” (via Wired How-To Wiki)