Chelyabinsk meteor explosion was a planetary defense wakeup call
On Feb. 15, 2003, a meteor exploded over the Russian city of Chelyabinsk, showing why we need better methods of detecting and tracking near-Earth asteroids.
TroibNews 
On Feb. 15, 2003, a meteor exploded over the Russian city of Chelyabinsk, showing why we need better methods of detecting and tracking near-Earth asteroids.
