For the past several centuries everyone believed that Mars was the most likely body in our solar system to support life beyond Earth. But, after centuries of telescope observation, decades of spacecraft exploration and several robots exploring its surface the promise of discovering life on Mars remains elusive. Now, scientific attention is being focused on Europa, the fourth largest of Jupiter’s 67 confirmed moons. It may be an even better candidate for finding life than Mars. For life to be present the three basic requirements are: 1) liquid water; 2) chemical building blocks; and, 3) a source of energy. Europa is thought to have all three. Read nice article on Geology.com. Gee, didn't we learn all about this from this article on The Enterprise Mission years ago.
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