Dust from the exploded Chelyabinsk meteor circles the globe.
On February 15, 2013, a 59-foot-wide space rock weighing 24,000 pounds screamed into Earth's atmosphere and exploded over Chelyabinsk, Russia, in what became the largest known meteor explosion since the 1908 Tunguska event. Combining observations from the NASA-NOAA Suomi NPP satellite with atmospheric models, NASA scientists traced the trail of dust left behind by the meteor. The researchers found that a belt of dust traveling tens of miles above the surface encircled the Northern Hemisphere just four days after the explosion. The dust initially moved east along the stratospheric jet stream at a velocity of 190 mph. Over time, larger and heavier particles began to lose speed and altitude, while smaller and lighter particles stayed aloft. By May 2013, a thin but detectable dust plume persisted in the atmosphere. Watch the video to learn more.