Vida en Marte, continua la polemica

[arteaga@...>]

        Parece que se acepta el origen marciano del meteorito. Ahora,
lo que no acaba de estar claro es si eso son fosiles. Los interesados
pueden visitar Scientific American,
http://www.sciam.com/WEB/1096issue/1096infocus.html  . Se discute un
par de "falsas alarmas" y creo que basta este parrafo para ilustrar 
una de las alternativas:



                 If not life, then what can account for this odd collection of
                 features? One possibility is a hydrothermal process.
                 "Imagine hot fluids flowing through the crust," suggests
                 John F. Kerridge of the University of California at San
                 Diego. "The crystallization of magnetite, iron sulfides and
                 carbonate with a change in the chemistry over time is
                 perfectly reasonable. If anywhere in the subsurface of
                 Mars there are PAHs, then they would be carried by this
                 fluid and deposited where the fluids crystallize. I think the
                 nanostructures are most likely an unusual surface texture
                 resulting from the way in which the carbonate
                 crystallized." 

Santi