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Researchers dispute meteorite evidence for life on Mars
‘•KEw YORK, Mav 22" A neW study contradicts NASA scientists' claim that a meteorite holds microscopic traces of long-ago life on Mars, reports AP.
In a paper published Thursday. three researchers from the University of Hawaii present electron microscope images of the now-famous meteorite, known as ALH84001.
According to their interpretation of those pictures, the alleged traces of live were formed not by ancient organisms, but by the huge shock that sent the rock hurtling into space millions of years ago.
Edward Scott, a professor at Hawaii's Institute of Geophysics and Planetology, examined along with his colleagues a tiny sliver of the Martian meteorite that they obtained long before last summer's hoopla.
In the sample there were tiny grains of carbonate, the same kind of mineral put forth by the NASA group as a sign that microbes once lived in the rock.
Examination under an electron microscope suggests that the carbonate grains were formed from a hot. highly pressurised fluid that was squirted into fractures in the surrounding rock.
That would have happened during the impact that knocked the meteorite off of Mars, sending it hurtling through space and ultimately to the Antarctic ice cap. where it is thought to have lain for at least 10,000 years before researchers scooped it up and delivered it to NASA, the US space agency.
• "Most .rtseirt^rs whb’‘h/^" farhifiaf with the fist sized meteorite agree that the grains were created during the impact that launched the rock into space. But few support Scott's contention, put forward in the British journal Nature, that it invalidates the NASA researchers' claim.
"I think that he's made some real interesting observations, but I think he s missing half the story.” said Allan Treiman, a research scientist at the Lunar and Planetary Institute in Houston.
The problem is that Scott and his colleagues. Akira Yamaguchi and Alexander Krot. didn't have in their sample the carbonate globs touted by the NASA scientists as remnants of ancient microbes
'the Hawaiian group argues that chemical similarities between the globs and the tiny grains they examined show that they were formed by the same process. But many of their colleagues don’t accept that argument.
"He's talking about oranges, we're talking about apples, said Everett Gibson, one of the NASA scientists who made the life on Mars announcement in August. "I don't think it's related at all to what we re talking about."
What the Hawaii research does show. Treiman said, is that the Martian meteorite is going to be a tough nut to crack.
The thing that surprises me about this rock is how complicated it's turned out to be.' he