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Enceladus Life Finder
Enceladus Life Finder (ELF) is a proposed astrobiology mission concept for a NASA spaceprobe intended to assess the habitability of the internal aquatic ocean of Enceladus, which is Saturn's sixth-largest moon and seemingly similar in chemical makeup to comets. The spaceprobe would orbit Saturn and fly through Enceladus's geyser-like plumes multiple times. It would be powered by energy supplied from solar panels on the spacecraft.
==Overview==
The Enceladus Life Finder mission has been proposed in 2015 for Discovery Mission 13 funding.〔 If selected, a launch readiness date of December 31, 2021 may be possible.
The ELF mission would search for biosignature and biomolecules in the geysers of Enceladus. The south polar jets loft water, salts and organic molecules dozens of miles over the moon's surface from an underground regional ocean. The theory is that the water is warmed by thermal vents similar to features found deep in Earth's oceans. ELF's instruments would measure amino acids — the building blocks of proteins — analyze fatty acids, and determine whether methane (CH4) found in the plumes could have been produced by living organisms.〔
In 2008, the ''Cassini'' orbiter was flown through a plume and analyzed the material with its neutral mass spectrometer. The orbiter detected simple organics, including methane (CH4), carbon monoxide (CO), carbon dioxide (CO2) nitrogen, and complex organic compounds. ''Cassini'' also detected sodium and potassium at a concentration implying a salty liquid ocean.〔 However, ''Cassini'' does not have the equipment with the sensitivity required for direct analyses.〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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