Scientists are working on a mission concept that focuses on bringing samples of ice particles from Enceladus, Saturn's sixth-largest moon, to Earth to be studied for signs of life. Enceladus has the four things needed to support life -- carbon, an energy source, nitrogen and liquid water. A space vehicle will fly through icy particles discharged into space by Enceladus' geysers and will send the collected samples in a capsule to Earth.

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