Her er pressemeldingen fra NASA om noen skulle være interessert 😉
Dagbladet tabloidiserer en smule, men spennende er det jo uansett!!!
From: [EMAIL="
[email protected]"]
[email protected][/EMAIL]
> To: [EMAIL="
[email protected]"]
[email protected][/EMAIL]
> Date: Thu, 15 Jan 2009 14:20:00 -0500
> Subject: Discovery of Methane Reveals Mars Is Not a Dead Planet
>
> Jan. 15, 2009
>
> Dwayne Brown
> Headquarters, Washington
> 202-358-1726
> [EMAIL="
[email protected]"]
[email protected][/EMAIL]
>
> Nancy Neal-Jones/Bill Steigerwald
> Goddard Space Flight Center, Greenbelt, Md.
> 301-286-0039/5017
> [EMAIL="
[email protected]"]
[email protected][/EMAIL], [EMAIL="
[email protected]"]
[email protected][/EMAIL]
>
> RELEASE: 09-006
>
> DISCOVERY OF METHANE REVEALS MARS IS NOT A DEAD PLANET
>
> WASHINGTON -- A team of NASA and university scientists has achieved
> the first definitive detection of methane in the atmosphere of Mars.
> This discovery indicates the planet is either biologically or
> geologically active.
>
> The team found methane in the Martian atmosphere by carefully
> observing the planet throughout several Mars years with NASA's
> Infrared Telescope Facility and the W.M. Keck telescope, both at
> Mauna Kea, Hawaii. The team used spectrometers on the telescopes to
> spread the light into its component colors, as a prism separates
> white light into a rainbow. The team detected three spectral features
> called absorption lines that together are a definitive signature of
> methane.
>
> "Methane is quickly destroyed in the Martian atmosphere in a variety
> of ways, so our discovery of substantial plumes of methane in the
> northern hemisphere of Mars in 2003 indicates some ongoing process is
> releasing the gas," said Michael Mumma of NASA's Goddard Space Flight
> Center in Greenbelt, Md. "At northern mid-summer, methane is released
> at a rate comparable to that of the massive hydrocarbon seep at Coal
> Oil Point in Santa Barbara, Calif." Mumma is lead author of a paper
> describing this research that will appear in Science Express on
> Thursday.
>
> Methane, four atoms of hydrogen bound to a carbon atom, is the main
> component of natural gas on Earth. Astrobiologists are interested in
> these data because organisms release much of Earth's methane as they
> digest nutrients. However, other purely geological processes, like
> oxidation of iron, also release methane.
>
> "Right now, we do not have enough information to tell whether biology
> or geology -- or both -- is producing the methane on Mars," Mumma
> said. "But it does tell us the planet is still alive, at least in a
> geologic sense. It is as if Mars is challenging us, saying, 'hey,
> find out what this means.' "
>
> If microscopic Martian life is producing the methane, it likely
> resides far below the surface where it is warm enough for liquid
> water to exist. Liquid water is necessary for all known forms of
> life, as are energy sources and a supply of carbon.
>
> "On Earth, microorganisms thrive about 1.2 to 1.9 miles beneath the
> Witwatersrand basin of South Africa, where natural radioactivity
> splits water molecules into molecular hydrogen and oxygen," Mumma
> said. "The organisms use the hydrogen for energy. It might be
> possible for similar organisms to survive for billions of years below
> the permafrost layer on Mars, where water is liquid, radiation
> supplies energy, and carbon dioxide provides carbon. Gases, like
> methane, accumulated in such underground zones might be released into
> the atmosphere if pores or fissures open during the warm seasons,
> connecting the deep zones to the atmosphere at crater walls or
> canyons."
>
> It is possible a geologic process produced the Martian methane, either
> now or eons ago. On Earth, the conversion of iron oxide into the
> serpentine group of minerals creates methane, and on Mars this
> process could proceed using water, carbon dioxide and the planet's
> internal heat. Although there is no evidence of active volcanism on
> Mars today, ancient methane trapped in ice cages called clathrates
> might be released now.
>
> "We observed and mapped multiple plumes of methane on Mars, one of
> which released about 19,000 metric tons of methane," said co-author
> Geronimo Villanueva of the Catholic University of America in
> Washington. "The plumes were emitted during the warmer seasons,
> spring and summer, perhaps because ice blocking cracks and fissures
> vaporized, allowing methane to seep into the Martian air."
>
> According to the team, the plumes were seen over areas that show
> evidence of ancient ground ice or flowing water. Plumes appeared over
> the Martian northern hemisphere regions such as east of Arabia Terra,
> the Nili Fossae region, and the south-east quadrant of Syrtis Major,
> an ancient volcano about 745 miles across.
>
> One method to test whether life produced this methane is by measuring
> isotope ratios. Isotopes of an element have slightly different
> chemical properties, and life prefers to use the lighter isotopes. A
> chemical called deuterium is a heavier version of hydrogen. Methane
> and water released on Mars should show distinctive ratios for
> isotopes of hydrogen and carbon if life was responsible for methane
> production. It will take future missions, like NASA's Mars Science
> Laboratory, to discover the origin of the Martian methane.
>
> The research was funded by the Planetary Astronomy Program at NASA
> Headquarters in Washington and the Astrobiology Institute at NASA's
> Ames Research Center in Moffett Field, Calif. The University of
> Hawaii manages NASA's Infrared Telescope Facility.
>
> For images related to this finding, visit:
>
>
>
>
http://www.nasa.gov/mars
>
>
> -end-
>