Scientists have so far detected at least 550 planets outside the solar system – and another 2,000-plus await confirmation. But how to pick out the ones that may be Earth-like havens for life? Here's what one team looks for in assessing any planet's potential habitability and its similarity to Earth's properties.
Scientists already knew Titan has the building blocks for organic life in abundance. Now, the discovery of a underground sea with liquid water adds another intriguing element.
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