February 2 
Shuttle Columbia broke apart entering earth's atmosphere Sunday morning OZ time with the loss of all 7 crew

Initial reports indicate a port wing failure (by overheating) possibly as a result of heat-shield thermal tile damage that occurred during launch 2 weeks earlier when some main fuel tank (frozen?) insulation fell off

Columbia was on its 28^th space mission and had just started to enter earth's atmosphere

It was America's 113^th space shuttle flight and 17 years since Challenger exploded during launch 60 seconds after lift-off on January 28, 1986