The Chelyabinsk Meteor: What We Know

In this episode of SciShow, Hank explores what we now know about the meteoroid that streaked across Russian skies on February 15, 2013.
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Sources:
http://www.theguardian.com/science/2013/nov/06/chelyabinsk-meteor-russia
http://www.popsci.com/article/science/what-we-now-know-about-chelyabinsk-meteor
http://phys.org/news/2013-11-results-russian-chelyabinsk-meteor-published.html
http://www.scientificamerican.com/article.cfm?id=chelyabinsk-meteor-eyewitness-trajectory
http://www.bbc.co.uk/news/science-environment-24839601
http://neo.jpl.nasa.gov/news/fireball_130301.html
http://www.nature.com/news/risk-of-massive-asteroid-strike-underestimated-1.14114