Two weeks after an asteroid exploded over Russia’s Ural mountains, scientists are making progress understanding the origin and make-up of the unexpected space rock. This week’s NASA ScienceCast video presents their latest results.
Comprehensive Report on What Exploded Over Russia
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Inside Chelyabinsk Meteor
Comprehensive Report on What Exploded Over Russia
Mass of the Largest Fragment of the Russian Meteorite Estimated to be 200-500 kg
Hiroshima Bomb Explosion vs. Russian Meteor
Russian Meteorite Bound to Become the 20th Meteorite with a “Birth Certificate”
When Space Attacks!
A Day Full of Space Rocks
Browse The Space Shuttle Columbia Disaster
How We Nearly Lost Discovery: Returning to Flight After Columbia
Remembering Columbia
Learning from Columbia
Organizational Factors of the Columbia Disaster
The Columbia Disaster and Space Program Safety 
Columbia And The Day of Remembrance
Sixteen Minutes from Home
STS-107: Columbia's Lost Crew
Timeline of the Columbia Disaster
Columbia Disaster Recommended Reading
Columbia Disaster Creative Works
The Columbia Disaster In Perspective![A trajectory analysis that used a computational fluid dynamics approach to determine the likely position and velocity histories of the foam (Credits: NASA Ref [1] p61).](http://www.spacesafetymagazine.com/wp-content/uploads/2014/05/fluid-dynamics-trajectory-analysis-50x50.jpg)
Cause and Consequences of the Columbia Disaster
Lessons Learned from the Columbia Disaster
Impact of Columbia Disaster on US Aviation Safety- Living with Columbia: Interview with Mike Cianilli
Remembering the Columbia Crew, One Day at a Time
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