新东方雅思培训 从0基础突破6.5

  下面新东方网雅思频道为大家整理了雅思阅读资料:恒星的降生,供考生们参考,以下是详细内容。

  科技类的文章不时就是雅思阅读考试中最常见的文章类型之一,下面就是小编整理的一篇关于恒星降生的科技类雅思阅读文章,恒星的“生老病死”关于研究宇宙的历史和现状以及估量宇宙的未来都是很大的协助,同时这个话题离我们平常生活也很远,文章了解起来有不少难点。

  SEATTLE, WASHINGTON—Studying newborns and toddlers reveals a lot about the first stages of human life, but to learn about conception and birth, you need to focus on a mother's womb. The same is true for stars. Astronomers know a lot about the first stages of a star's life, but its conception and birth are still shrouded in mystery. Quite literally, actually: Stars are born in the cores of dark, dense, cold clouds of dust.

  Now, the European Planck satellite has revealed more than 10,000 of these extremely cold stellar wombs. Surprisingly, many of them turn out to be larger than astronomers had expected. "It's hard to understand how such large concentrations of gas can stay this cold," says Planck team member and astrophysicist George Helou, director of the Infrared Processing and Analysis Center at the California Institute of Technology in Pasadena.

  The Cold Core Catalogue of Planck Objects was presented here today at the 217th meeting of the American Astronomical Society as part of the release of the first scientific results from the Planck mission. Other Planck results released today are related to remote galaxy clusters, dusty galaxies in which large numbers of new stars are born, and extremely rapidly spinning dust particles in our own Milky Way.

  Planck was launched in May 2009. The mission's ultimate goal is to learn more about the evolution of the universe by mapping the cosmic background radiation—the faint afterglow of the big bang. That could take another year or two, says Charles Lawrence of NASA's Jet Propulsion Laboratory, one of Planck's project scientists. Meanwhile, Lawrence says, the space observatory is revealing a lot about "everything else in the universe."

  The stellar wombs are a case in point. "These are the coldest objects known in the universe," says Lawrence; some are just 7° above absolute zero. Such cold objects give off faint radiation at wavelengths shorter than 1 millimeter, and Planck's sensitive detectors are great at finding them, says Helou.

  Using the sharper view of another European space observatory called Herschel, astronomers have studied 10 of the cold cores discovered by Planck in more detail. They turn out to be elongated and grouped into filaments. Moreover, they show a wide variety of shapes, sizes, and substructure. Some of these smaller clumps are no larger than 1 light-year across—about the size of the giant cloud of comets surrounding our own solar system.

  Helou is confident that the Planck observations will eventually lead to "a much better understanding of the critical last steps leading up to stellar birth." Specifically, astronomers want to know how and how fast a collapsing cloud of gas fragments into different stars. There's a lot of follow-up work to be done, however. The Planck team believes the large variety of cold cores corresponds to different stages in the prenatal evolution of stars, from cold, starless clumps to young protostellar objects still embedded in their surrounding cloud. Says Helou: "We have to place these objects in the right sequence."

  以上就是关于恒星的降生这个科技话题的雅思阅读全部内容,十分详细的引见了相关的话题,大家能够在备考雅思阅读考试和雅思小作文的时分,对这篇文章中止恰当的参考和阅读。

  以上就是新东方网雅思频道为大家整理的雅思阅读资料:恒星的降生,十分适用。更多资讯、资料尽在新东方网雅思频道。最后,新东方网雅思频道预祝大家在雅思索试中取得好成果!

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新东方雅思培训 从0基础突破6.5

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