How the Fermi Spacecraft Almost Got Taken Out by a Relic of the Cold War

As a space telescope scientist or satellite operator, the last thing you want to hear is that your expensive and possibly one-of-a kind -- maybe irreplaceable -- spacecraft is in danger of colliding with a piece of space junk. On March 29, 2012, scientists from the Fermi Gamma-ray Space Telescope were notified that their spacecraft