Toxic Touchdown
NASA

 
A secret Soviet-navy satellite called Cosmos 954, which was launched on Sept. 18, 1977, spiraled out of control. The spy radar antennas each sported a compact nuclear reactor, making the reentry one of the most frightening to date for people on the ground. On Jan. 24, 1978, Cosmos 954 reentered over Canada and shed debris across the frozen ground of the Canadian Arctic. Following the crash, the U.S. and Canada conducted overflights of the area and associated cleanup efforts.
Number 6: Desert Dropdown
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