NASA, Air Force satellites nearly collided in space over Pittsburgh; near miss in time

Two well-tracked human satellites had a fair chance of colliding in space above Pittsburgh, Pennsylvania; but had a near miss. According to various media reports, the satellites missed each other with a slight distance, adding that an increasing number of satellites in space made the situation more vulnerable. The two satellites involved were -- Infrared Astronomical Satellite (IRAS), an old space telescope that was part of a joint mission between NASA, the Netherlands, and the United Kingdom; and GGSE-4 -- a part of a gravitational experiment that the United States Air Force launched in May 1967. 

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