Details on the Feb 15th meteor that exploded above Chelyabinsk in Russia are in. Why didn't we see it? It flew in from the direction of the sun, where our telescopes couldn't see it until it was too late. The meteor lasted about 30 seconds within our atmosphere before it exploded with the force of about 20 nuclear bombs.
Check out the video below from ScienceCasts for more details. If you can't see the video below, please click here.