math from the news, calculations from the meteor over Chelyabinsk, Russia

Scientists think that the meteor that lit up skies over Russia originated in the asteroid belt

On Feb. 15, 2013, a small asteroid entered Earth’s atmosphere over Chelyabinsk, Russia. Estimates put the asteroid at ~17 meters in diameter with a mass of ~11,000 metric tons and traveling ~18 km/sec.  This NASA created math activity can be used in classrooms to use a real world headline making event in their math lessons.

for science educators, outreach volunteers, amateur astronomers, or maybe just me