When sea ice melts, as it has done in the Arctic Ocean at a disturbing rate over the past decade, the albedo of the area affected changes dramatically, from around 80% down to less than 10%. This is a...When sea ice melts, as it has done in the Arctic Ocean at a disturbing rate over the past decade, the albedo of the area affected changes dramatically, from around 80% down to less than 10%. This is a positive feedback because much more solar energy is absorbed by the water than by the pre-existing ice, and the temperature increase is amplified.
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.
