[SKRIVA] *Flytande* vatten på Mars
- From: Ahrvid Engholm <ahrvid@xxxxxxxxxxx>
- To: <skriva@xxxxxxxxxxxxx>, <sverifandom@xxxxxxxxxxxxxxxxxxxx>
- Date: Sat, 14 Mar 2009 17:15:28 +0100
Efteranalys av data från rymdsonden Phoenix - enligt en artikel i Spaceflight
Now - visar tecken på flytande vatten på Mars. Tidigare har man (flera gånger
om) fått bevisat att vatten finns i frusen form. Vid denna planets låga
atmosfärstryck brukar dock vattenis "subliminera" (som det kallas) direkt från
fast till gas-form.
Artikeln finns på:
http://spaceflightnow.com/news/n0903/08marswater/
Några utdrag:
'The findings are compiled in a new report "The Physical and Thermodynamic
Evidence for Liquid Water on Mars." The report will be presented March 23 at
the 40th Lunar and Planetary Science Conference in Houston. ...
It is imagery of splotches of Martian material on the spacecraft's landing
gear that moved, then merged, that convinced the nearly two dozen Phoenix
scientists that "liquid saline-water exists in areas disturbed by the lander,"
says the report. This is described as "smoking gun" evidence for the presence
of liquid water at the landing site.
This stunningly significant finding of contemporary brine-like water on
surface of Mars has major implications for the potential for current Martian
life. It does not guarantee life, however, because the fluid could be too
fleeting and salty for life. ...
Science team members say in the paper that the finding will affect virtually
every aspect of Mars research, including new Mars spacecraft development beyond
the Mars Science Laboratory rover set for launch in 2011.
"This finding has important implications for the stability of liquid water,
weather, mineralogy, geochemistry and the habitability of Mars," says the
paper.'
(Not: Om vattnet är salthaltigt - kanske ännu saltare änt ex jordens oceaner -
torde det påverka dess fryspunkt, och vattnet kan tänkas kunna vara flytande
inom andra temperatur- och tryckområden än vad vi är vana vid på jroden. En
lätt spekulation.)
--Ahrvid
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