Could There Be Life on the New Earth-Size Planets? (SPACE.com)

SPACE.com - For life as we know it to arise on another planet, scientists think the alien world must have three key ingredients: organic molecules that can form complex structures, energy to jiggle those molecules, and liquid water for them to jiggle in. It’s a short recipe, but nonetheless, only planets that are extremely similar to Earth can possibly have all three items in stock.

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