"A broadside collision between two satellites -- one of them an operational Iridium communications relay -- was the worst orbital accident on record and may wind up rivaling the 2007 Chinese anti-satellite weapon test in the debris cloud it created.
The Iridium satellite -- one of 66 in the "Big LEO" low-Earth orbit constellation -- and the 16-year-old Cosmos 2251 Russian government communications satellite collided at an altitude of 790 kilometers with a closing velocity of about 7 miles per second shortly before noon Tuesday EST."
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