Twenty-five years ago last month, the Viking 1 space probe landed on Mars and spent the next 61/2 years sending back data about the Red Planet. Viking 1 stopped transmitting in 1982 while its sister probe, Viking 2, which landed in September 1976, fell silent after three years. Read More
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Mars controversy alive 25 years after Viking 1
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Mars controversy alive 25 years after Viking 1