A metal sphere found by Dean Gentz on February 28 in his pasture in Buna, Texas, US. The sphere bears signs of being exposed to extreme heat as if having undergone the atmospheric re-entry. The source might be a Chinese rocket body CZ-4B.
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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