托福听力课外资料练习:科学美国人60秒太阳系外发现碳元素相关内容分享
- 2017年07月24日13:40 来源:小站整理
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在托福听力考试的备考过程中,科学美国人60秒相信大家一定用得比较多,那么大家平时是如何利用这个课外资料的呢?这里小编整理了科学美国人60秒:太阳系外发现碳元素相关的内容分享,大家一起来学习一下吧。
科学美国人60秒听力练习:太阳系外发现碳元素
科学美国人60秒英文文本
Analysis of the chemical signature of gas giant exoplanet WASP 12 b reveals it to have a highly unusual makeup of more carbon than oxygen, with implications for the types of rocky planets that may be out there. Christopher Intagliata reports
通过对太阳系外行星(编号:WASP-12B)的气体化学特征分析显示:其气体构成中碳含量远超过氧含量,表明该处可能存在此种类型的岩石结构行星。
Imagine climbing diamond mountains, or hiking around the graphite shores of a lake of tar. Sound a little sci-fi? Well a new discovery suggests planets like that might be out there—planets littered with carbon minerals, instead of the oxygen-rich silicates, like quartz, that cover the Earth. Because astronomers have found the first carbon-rich exoplanet, with more carbon than oxygen in its atmosphere—instead of the 1 to 2 carbon to oxygen ratio found in our solar system.
The exoplanet, called WASP 12 b, is a gas giant, like Jupiter. By taking the spectrum of heat radiating from the planet, the researchers found that the planet's atmosphere was loaded with carbon, in the form of carbon monoxide and methane. The study appears in the journal Nature. [Nikku Madhusudhan et al., "A high C/O ratio and weak thermal inversion in the atmosphere of exoplanet WASP-12b"]
The finding suggests one commonly accepted model of planetary formation, where icy chunks glom into a core, wouldn't work here.
Instead the core may have formed from carbon-rich fragments, like tar. But more than that, this unusual planet is more proof of the diversity of the universe—and it makes those dreams of diamond planets a tiny bit more plausible.
科学美国人60秒中文翻译:
想象一下去攀登一个钻石山,或是去一个石墨围岸的焦油湖畔远游。听起来有点科幻?一项新发现表明这样的行星群可能存在--它们表面分布大量的含碳矿物,而非类似覆盖地球的石英这类的富氧硅酸盐。因为天文学家发现了第一个富含碳的系外行星,其大气中碳含量远超过氧含量,而非太阳系的1:2碳氧比。
这个太阳系外行星,被称为WASP-12B【黄蜂12B】,是一个类似木星的巨大气体星球。通过对它的辐射热光谱取样,研究人员发现这颗行星的大气层中以一氧化碳和甲烷的形式存在着大量碳元素。这项研究发表于《自然》期刊。 [Nikku Madhusudhan等:系外行星WASP-12B大气分析“高碳氧比与弱热能转换”]
该发现表明关于行星内部由冰块构成这一广为接受的认知模式在此是行不通的。相反,行星核心的构成可能是富含碳的物质,例如焦油。但更重要的是,这颗不同寻常的星球提供了宇宙多样性的明证,而且它也使得寻找钻石行星的梦想变得有点合理了。
—Christopher Intagliata
1. exoplanet n. 外部行星
2. graphite n.石墨
3. quartz n.石英
4. spectrum n.谱,光谱,频谱;
5. monoxide 一氧化物
6. methane 甲烷
7. chunk n.厚片,大块;
8. plausible a.似乎正确的,貌似可信的
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