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Life on Mars did not notice?

November 10 2006
18:52

The fact that in the past Mars was inhabited by the simplest living beings, a few years ago, scientists announced NASA. Such a conclusion they did, after a study found the meteorite on Earth. A hypothesis has caused many critics and some arguments in favor of the existence of living beings on Mars were refuted.

Scientists at the University of Arizona conducted a re-analysis of the crystals, previously adopted for the waste products of bacteria. With the electron microscope allowed for a more detailed analysis of the particles. After some investigation, the researchers made the following verdict: "Re-examination of the magnetite crystals in the meteorite ALH84001 does not prove the previously anticipated availability of live bacteria on Mars."

By topic:

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Is there life on Mars? Scientists continue to debate

Moon - Space Station "outsiders": those who attacked a neighbor of the Earth?


Whatever it was, but scientists continue to study and put an end to the dispute about the possible existence of life on Mars yet. Recently, an international team of researchers from the U.S., Canada, Germany, Taiwan and South Africa, led by Professor of Geology Tullys Onstott of Princeton University discovered a community of bacteria that have adapted to life at a depth of 2.8 kilometers.

Researchers conducted geochemical, microbiological and molecular analysis of alkaline groundwater, zampolnivshih break in the basalt rocks in a South African gold mines. The analysis revealed the presence of an unknown species of bacteria, which is a distant relative of the bacteria, Firmicutes, live in the submarine hydrothermal "black smoker".

A feature of this type of bacteria is the complete independence of the energy of sunlight and organic compounds. They are able to use the energy that is produced by radioactive decay of uranium, thorium and radioactive isotope of potassium.

Professor Onstott suggests that micro-organisms adapted to life in such harsh conditions, can live on Mars, the satellites of Jupiter and Saturn - Europe and Titan, and even in the nuclei of comets.

Incidentally, the U.S. spacecraft Viking 1 and Viking 2, studying the Martian surface about thirty years ago, could not see life on the Red Planet. This is the opinion of scientists from the University of Mexico, conducted the research under the guidance of Rafael Navarro-González.

Experts have repeatedly pointed out that the devices "Viking" were equipped with sufficient precision instruments and, therefore, in principle, could not find traces of life on Mars. Now scientists from the University of Mexico have been able to prove in practice that the sensitivity of the equipment installed on ships NASA, was too low for detection of Martian bacteria.

Team Navarro-Gonzalez held a series of experiments that used a gas chromatograph and mass spectrometer for analysis of soil samples taken in those parts of the Earth, where conditions are most close to the Martian. As a result, devices and found no traces of life, although the bacteria known to exist in the Rio Tinto, and in the Atacama Desert, where the research was carried out. Thus, according to scientists, the bacteria can exist on Mars.

p align = "justify"> In addition, scientists have not found the answer to the question - why Martian soil has very high oxidizing ability, and the level of organic compounds in it is extremely low? According to one hypothesis, in the Martian soil contains the unknown oxidizing substances. Other scientists believe that the Red Planet, there are bacteria, intracellular fluid which is a mixture of water and hydrogen peroxide. It is this fluid and may play the role of oxidant.

Constantine Dyatlov

On materials: X-mars.narod.ru, Radio Liberty, Kompyulenta, New Scientist Space.

Константин Дятлов

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