20 Seconds, Then Silence
Credit: NASA

 
Like its sister craft Mars 2, the Soviet Union's Mars 3 landing mission is a marriage of engineering accomplishments and inexplicable failure. The lander appears as the conical top of the Mars 3 orbiter mothership in this image.

The probe launched in May 1971 and landed successfully on Dec. 2, 1971 in the martian uplands of Terra Sirenium after descending through the same dust storm that thwarted its Mars 2 predecessor (see No. 10). But 20 seconds after beginning its first photographic scan, Mars 3's TV signal went silent for good.
Number 8: Lost Beagle
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