And the The Biggest Space News Video of 2013 is...

 This is the biggest space story of the year simply because of the instant raising of awareness it engendered, even in the most non-scientific communities, that we (and our planet) are part of a much larger and very active existence.

"The Chelyabinsk airburst was the largest since Tunguska in 1908, but unlike that and other historic events, the strike was recorded by a full suite of modern technology: satellites photographed the meteor, security and personal video cameras filmed the path across the sky, and sensors picked up infrasound waves as lumps hit the ground..."