[SKRIVA] Mer om marsliv

From: Ahrvid Engholm <ahrvid@xxxxxxxxxxx>
To: <skriva@xxxxxxxxxxxxx>, <sverifandom@xxxxxxxxxxxxxxxxxxxx>
Date: Sat, 8 May 2010 19:14:07 +0200
Nämnde tidigare att forskare i februari ansåg sig vara "mycket nära" att bevisa 
att Mars har/hade liv. Detta kan möjligen vara något som åsyftades, från 
relativt nyligen under en konferens 4 maj.
Bl a anser man att man hittat mikrofossiler i andra, tidigare inte studerade 
marsmeteoriter. (Utdragen ger bara en del av rönen och debatten, förstås. Läs 
hela artikeln!)
 
http://www.washingtonpost.com/wp-dyn/content/article/2010/04/30/AR2010043002000.html
 
" 'We feel more confident than ever that Mars probably once was, and maybe 
still is, home to life,' team leader David McKay said at a NASA-sponsored 
conference on astrobiology. ... the team's central finding -- that Mars once 
had living creatures -- has gained broad acceptance among the biologists, 
chemists, geologists, astronomers and other scientists who make up the 
astrobiology community. ... He also pointed to the presence of what appear to 
be fossilized microbes in other Martian meteorites, as well as the steady flow 
of discoveries by others pointing to a Mars that at one time could have 
supported life -- wet, warmer and enveloped in a potentially protective 
atmosphere and a magnetic field. ...
  Critics had said that the magnetites /= mikrofossilerna/ could have just as 
easily existed without bacteria or biology -- that they sometimes form as a 
result of the shock and searing heat that could come, for instance, from an 
asteroid strike. But in the recent paper, Thomas-Keprta, an expert in the use 
of electron beam technology to look inside rocks, reported that the purity of 
the magnetites made that explanation impossible. 
  Reflecting both the contentiousness and drama of the debate, Thomas-Keprta 
finished her talk by referring to a recent article in a science journal that 
said the astrobiology community had 'mostly abandoned' the biological 
explanations for the makeup of ALH84001. Her retort: "As Mark Twain put it, 
'Reports of our death have been greatly exaggerated.' " 

--Ahrvid
 
Ps. Jag vidhåller min tidigare bedömning att sannolikheten talar mot liv på 
Mars, men det är alls inte *omöjligt* (att det finns eller har funnits)

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IQ-HJÄLP! (DN NoN 00.02.07)                                        
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[SKRIVA] Mer om marsliv

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