Scientists have been reviewing the images taken by Spirit rover nearly a decade ago. They also concluded that the United States Space Agency (NASA) may previously ignored evidence of the earliest forms of life on other planets.
As reported Express on Sunday, November 27, 2016, a new evidence published in Nature Communications showed outcrop rocks and regoliths formed of opaline silica photographed by Spirit Rover in Gusev Crater in 2007 could potentially have biosignatures, the nature trails current or past.
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| Spot the difference: Silica deposits on Mars, inset, compared to on Earth. (Picture from: http://adf.ly/1gGAh9) |
Two experts from Arizona State University (ASU), Steve Ruff and Jack Farmer looked at data from the visits of Spirit Rover to Home Plate, a plateau of layered rock in the crater region of Columbia Hills. It is an ancient region of volcanic ash eroded, believed to still contain active hot water, which has formed silica outcrops, including finger-like formations which were photographed.
In addition, they also occur in less obvious forms, including organic molecules remaining trapped in rocks and compacted mat of microbes known as stromatolites, which is an early form of life on Earth, and are found in Western Australia, and El Tatio in Chile.
Stromatolites are formed when microbial colonies gathered in a humid environment, before trapping sediment in a sticky surface. Sediment reacts with the calcium carbonate in the water, creating a buildup of lime.
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| Proof of life? The silica deposits on Mars, left, are remarkably similar to on Earth, right. (Picture from: http://adf.ly/1gGAh9) |
Stromatolites in El Tatio, which has conditions similar to Mars also formed by hot springs, said to resemble images taken in the Spirit Rover in the Mars crater. Deposits of silica in the structure in EI Tatio discovered by a team almost identical to that found in Gusev Crater.
"Our results indicate that the condition is more like Mars than El Tatio produce unique deposit, including biomediated silica structure, with characteristics that are favorable compared with the silica outcrops of Home Plate. This similarity raises the possibility that Mars silica structure is formed in a way that is comparable," as the team wrote in the report.
On a separate report last month by a different team of scientists concluded evidence of life on Mars may have been discovered in 1976, but scientists suggest it then do not believe it. A review study called Viking Labeled Release, see the two probes land on the Red Planet, brings interesting claims that the soil collected from Mars indicate microbial life.
The spacecrafts landed 4,000 miles of each other on Mars in the 1970s, but both produce the same surprising results after the Martian soil analysis. *** [EKA | FROM VARIOUS SOURCES | EXPRESS]
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