One of Saturn's moons. It has a diameter of about 500 km, and its surface is covered with a thick layer of ice. It was discovered in 1789 by astronomer William Herschel. Since 2005, observations by the Cassini space probe operated by NASA (National Aeronautics and Space Administration) and others have revealed that there is a vast ocean beneath Enceladus, and that water vapor and ice containing organic matter are spewing out. In 2015, analysis and experiments conducted by an international research team including the University of Tokyo Graduate School and the Japan Agency for Marine-Earth Science and Technology revealed that there is a high possibility that hot water that nurtures primitive microorganisms is bubbling up from the ocean floor. This has raised the possibility that Enceladus has the three elements necessary for the birth of life - water, organic matter, and energy (heat) - and has attracted attention as a discovery that supports the existence of extraterrestrial life. (2015-3-16) Enceladus(2013-8-5) Source: Asahi Shimbun Publications About Chiekura Mini Information |
土星の衛星の一つ。直径は約500キロメートルで、表面は厚い氷に覆われている。1789年、天文学者ウィリアム・ハーシェルによって発見された。2005年以降、NASA(アメリカ航空宇宙局)などが運営する探査機カッシーニの観測により、エンケラドスの地下には広大な海が存在し、有機物を含む水蒸気や氷が噴き出していることが分かった。15年には、東京大学大学院や海洋研究開発機構などの国際研究チームが行った分析・実験により、海底から原始的な微生物を育む熱水が沸きだしている可能性の高いことが明らかにされた。これにより、エンケラドスには水、有機物、エネルギー(熱)という生命の誕生に必要な3要素が整っている可能性が高まったことから、地球外生命の存在を後押しする発見として注目を集めている。
(2015-3-16) エンケラドス(2013-8-5) 出典 朝日新聞出版知恵蔵miniについて 情報 |
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