Word: soiling
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Speculation that life exists on Mars has decreased this week even though the Viking spacecraft that landed on the planet more than two weeks ago relayed data back to Earth indicating Martian soil samples were emitting large quantities of oxygen...
Richard M. Goody, Mallinckrodt Professor of Planetary Physics, who is chairman of the Space Sciences Board, said yesterday scientists have realized the presence of hydrogen peroxide in small amounts on Mars could explain the high oxygen content of the soil...
...presence of oxygen was detected by the pyrolytic release experiment which was designed to test for the occurence of photosynthesis by exposing a soil sample to radiation from a xenon lamp. The oxygen was produced before the lamp was switched...
...additional experiments are included in the biology package on board Viking. The gas exchange looks for evidence of respiration by adding some moisture and nutrients to the soil to determine if the soil is "breathing...
...third experiment, the so-called "chicken-soup experiment," involves innoculating the soil with a complex nutrient broth that provides substrates for many biological activities. The soil is then incubated to encourage the growth of life...