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Acetylene and hydrogen molecules1 are disappearing from the atmosphere of Saturn’s moon, Titan. It’s a mystery befitting Sherlock Holmes’ investigative skills, a mystery NASA scientists hope to crack. About fifty percent larger than Earth’s moon, Titan is Saturn’s largest satellite and the only moon with an atmosphere. It has long been known for its methane2- and ethane-rich atmosphere, and has intrigued3 scientists when they discovered lakes of liquid methane on its surface. Titan is a frigid4 place, with temperatures hovering5 around minus three hundred degrees Fahrenheit6, but despite the cold, scientists wonder if Titan may harbor life. Life as we know it on Earth is carbon based, and Titan has the same hydrocarbon7 building blocks for living organisms. But, can life exist at such low temperatures, and if it does, can we detect its presence? Missing molecules may be our first clue. Hydrogen molecules should be produced when ultraviolet light breaks down methane and acetylene molecules in Titan’s atmosphere.
1 molecules | |
分子( molecule的名词复数 ) | |
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2 methane | |
n.甲烷,沼气 | |
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3 intrigued | |
adj.好奇的,被迷住了的v.搞阴谋诡计(intrigue的过去式);激起…的兴趣或好奇心;“intrigue”的过去式和过去分词 | |
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4 frigid | |
adj.寒冷的,凛冽的;冷淡的;拘禁的 | |
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5 hovering | |
鸟( hover的现在分词 ); 靠近(某事物); (人)徘徊; 犹豫 | |
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6 Fahrenheit | |
n./adj.华氏温度;华氏温度计(的) | |
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7 hydrocarbon | |
n.烃,碳氢化合物 | |
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