This page discusses NASA's Viking missions, which sought evidence of life on Mars in 1976 but found none conclusively. The ambiguous results of the Labeled-Release and Gas-Exchange experiments were la...This page discusses NASA's Viking missions, which sought evidence of life on Mars in 1976 but found none conclusively. The ambiguous results of the Labeled-Release and Gas-Exchange experiments were later linked to nonbiological processes. Although the Curiosity rover discovered organic compounds and Martian meteorites like ALH84001 contain organic molecules, the potential for contamination complicates the findings.
