The Quadrantids and the Great Wall

The Quadrantid meteor shower peaked last week on Jan. 3. The Earth plowed through the debris left behind by the asteroid 2003 EH, creating thousands of shooting stars in the sky. Most debris trails are left by comets and are pretty wide, which means the showers can last for days. The Quadrantid source trail, though, is really narrow, which means the number of meteors in the Quadrantids peaks very sharply, essentially going from nothing to 120 meteors per hour to nothing again in less than a day....