One of Jupiter's moons, Europa, has an icy terrain that is suspected to have liquid water underneath the ice. Considering these conditions, scientists believe that high levels of radiation surrounding Jupiter could be enough to cause chemical reactions to harbor life on Europa. Scientists used the analogy that starting life is like starting your Chevy, you need fuel and a little bit of oxidant. Scientists have also agreed that Europa is the likeliest object in our solar system to harbor life on it. However, when they state "life" they don't mean gigantic life forms, but rather little critters underneath the icy surface. The significance to Europa is that it is about the size as planet Earth's moon, however, it has twice the potential volume of water as Earth does, which signifies a large chance of life on Europa. Researchers say that the only way to really know whether there is life on Europa or not, is by going there and taking samples.
http://www.space.com/scienceastronomy/solarsystem/europa_life_000126.html
Science, Technology and Society 361: "Mars Exploration" -- Fall 2010
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