Life.....?

Could there possibly be life on Callisto? According to astronomers a body in space has to have certain characteristics in order to possibly support life. A planet needs a liquid water, an oxygen atmosphere, and a magnetic field minimum in order to support life. Callisto does not really have these characteristics. Although there is water on Callisto, it is not liquid, it is frozen. Although, Callisto has an atmosphere it is comprised mostly of carbon dioxide, and is very very thin, and some astronomers think it even disappears and comes back often. Callisto does not have an internally generated magnetic field. Although Callisto does not have any of the characteristics necessary to support life, I still think, like scientists that there could be one celled organisms below its ice and rock surface.

Alien Organism :)

Although Callisto does not have the characteristics to support life, scientists have come up with a few bodies that can possibly support life. One of them is Mars. Mars is the fourth planet away from our sun and is classified as a terrestrial planet. The reason some scientists believe there is life on it is because in 1997 a small robotic rover named Sojourner found abundances of water on mars. A more recent reason is that in a meteor that supposedly came from mars had life on it. I agree with the astronomers and scientists on this one, because it is quite possible that there could be life outside of earth.

Mars: The Red Planet

Sources:
http://science.nasa.gov/newhome/headlines/ast22oct98_2.htm
http://www.windows.ucar.edu/tour/link=/jupiter/moons/callisto_atmosphere.html&edu=high
http://www.solstation.com/stars/jupiter.htm
http://www.solarviews.com/cap/jup/callist1.htm
http://www.nature.com/nature/journal/v387/n6630/abs/387262a0.html
http://seds.org/~spider/spider/Mars/mmetlife.html
http://seds.org/~spider/spider/Mars/mmetlife.html