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NASA's Viking missions, which landed on Mars some 40 years ago, may have detected signs of extraterrestrial life. The problem: With the measuring instruments, the robots accidentally burned the samples. At least one new study claims
Viking 1 and 2 landed on Mars in 1975 and 1976, respectively. Although they were designed only to provide 90 days of data, they photographed and mapped the red planet for six years. However, the legacy of the Vikings lacked something: no organic sample was taken.
However, NASA confirmed last month that Curiosity Rover, a successor to the Vikings, has found three billion years of life. Because the Vikings heated gas instruments to process their samples, it is thought that they accidentally burned the samples. This resulted in highly flammable salt perchlorate on Mars, which in turn was found by the Phoenix Mission in 2008. Because chlorobenzene also forms when carbon molecules burn with perchlorate, experts conclude that the samples burned.
However, there is also a presumption: Melissa Guzman, a scientist at the LATMOS research center in France, rather suspects, that chlorobenzene was brought by the vicinings themselves from the earth to Mars.
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