NASA Physicist Finds Evidence Of Life In Space - Maybe
From: Stig_Agermose@online.pol.dk (Stig Agermose)
Date: Mon, 4 Aug 1997 18:12:33 -0800
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>From the Nando Times:
http://www.nando.net/newsroom/ntn/health/080197/health12_9173.html
Scientist finds evidence of life in space - maybe
Copyright ©1997 Nando.net
Copyright ©1997 Reuter Information Service
SAN FRANCISCO (August 1, 1997 8:33 p.m. EDT) - A NASA physicist said on
Friday he had found what may be the fossilized remains of
extraterrestrial microorganisms in a meteorite, providing more evidence
that life may have existed beyond Earth.
Astrophysicist Richard Hoover said that while investigating samples of
the Murchison meteorite that fell on Australia in 1969, he had found
complex structures that appeared to be biological.
"It is potentially the case that it's signs of life from somewhere
other than the planet Earth. That is a real possibility that must be
considered," Hoover told Reuters in a telephone interview from San
Diego.
Hoover, an astrophysicist at the National Aeronautics and Space
Administration's George C. Marshall Space Flight Center in Huntsville,
Alabama, cautioned that more study was needed and he could not say for
sure where the microscopic structures came from.
Hoover's work appears to support the findings of U.S. scientists who
announced last year that they had found possible fossilized microbes in
a meteorite from Mars.
In a scientific paper presented at a conference in San Diego this week,
Hoover said he had concluded that the Murchison meteorite contained "a
population of indigenous microfossils," shaped like mushrooms, stalks
or filaments.
The mushroom-shaped bodies "are considered to represent the carbonized
remains of biological forms," he wrote.
Hoover obtained images of the forms using an environmental scanning
electron microscope and analyzed them with x-ray energy dispersive
spectroscopy.
The bodies resembled some types of bacteria, but experts had been
unable to identify them as known earthly microbial groups, Hoover said.
He said the bodies resembled other unidentifiable forms found in
another meteorite by earlier researchers.
"It is concluded that this population of complex structures may
represent remains of extraterrestrial microorganisms which lived within
or contaminated the parent body of the Murchison meteorite at various
times during the past 4.4 billion years," Hoover wrote.
The parent body of the Murchison meteorite is unknown, but Hoover said
there was strong evidence that it did not come from Earth, the moon or
Mars and may have come from a comet or asteroid.
He said the structures he had observed appeared to have arrived on
Earth with the meteorite and not be something that found its way there
after it landed.
It was also possible that asteroid impacts on Earth billions of years
ago could have catapulted materials from Earth into space and that any
microfossils in the meteorite could have originated on Earth. But the
same thing could have happened on Mars or another body, he said.
"We are doing additional work to determine what (the structures) are
... and to determine if we can obtain carbon isotope measurements to
give an idea of whether they are terrestrial or extraterrestrial in
nature."
He said that earlier this year a scientific team in Russia reported
finding similar structures within the Murchison meteorite.
Hoover said scientists must continue studying meteorites.
"The meteorites are messages from space. They are bringing us
information that we must study and learn, telling us where to go to
seek conclusive proof for the existence of extraterrestrial life," he
said.
Copyright ©1997 Nando.net
Index: Exobiology
Created: Aug 4, 1997
