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华沙大学天文学家根据追踪遍布银河系的数千颗大的脉动饮料变星【亚博网页版登录】


本文摘要:AstronomershavecreatedthemostprecisemaptodateoftheMilkyWaybytrackingthousandsofbigpulsatingstarsspreadthroughoutthegalaxy,demonstratingthatitsdiskofmyriadstarsisnotflatbutdramaticallywarpedandtwistedinshape

Astronomers have created the most precise map to date of the Milky Way by tracking thousands of big pulsating stars spread throughout the galaxy, demonstrating that its disk of myriad stars is not flat but dramatically warped and twisted in shape.天文学家根据追踪遍布银河系的数千颗大的脉动饮料变星,绘图出拥有目前为止最精确的银河系地图。从地图上看,由成千上万恒星组成的星系盘并不是平扁,而很明显是歪斜的、形变的。The researchers on Thursday unveiled a three-dimensional map of the Milky Way - home to more than 100 billion stars including our sun - providing a comprehensive chart of its structure: a stellar disk comprised of four major spiral arms and a bar-shaped core region.科学研究工作人员于上周四公布了一张银河系的三维地图,在其中还包含太阳光以内总共1000多亿颗恒星。

这张地图全方位展览了银河系构造:由四个大的螺旋式型枝叶和一个条形的关键地区组成的星系盘。For the first time, our whole galaxy - from edge to edge of the disk - was mapped using real, precise distances, said University of Warsaw astronomer Andrzej Udalski, co-author of the study published in the journal Science.调查报告的创作者之一、华沙大学天文学家安德列·乌达尔斯基说:“从星系盘的一端到另一端,大家第一次用以实际、精确的间距绘图了全部银河系的地图。”调查报告公布发布在《科学》杂志期刊上。

造父变星

Until now, the understanding of the galaxys shape had been based upon indirect measurements of celestial landmarks within the Milky Way and inferences from structures observed in other galaxies populating the universe.到迄今为止,人们对星系样子的讲解是根据对银河系内星体标示的等效替代法,及其对宇宙空间中别的星系构造的推断。The new map was formulated using precise measurements of the distance from the sun to 2,400 stars called Cepheid variables scattered throughout the galaxy.这幅新的地图是根据精准测量散布在银河系中的2400颗“造父变星”与太阳光中间的间距而绘图的。Cepheids are ideal to study the Milky Way for several reasons, added University of Warsaw astronomer and study co-author Dorota Skowron.“造父变星是科学研究银河系的理想化随意选择,缘故有很多,”华沙大学天文学家、调查报告的年出版者多洛塔·斯考伦补充道。

天文学家

Cepheid variables are bright supergiant stars and they are 100 to 10,000 times more luminous than the sun, so we can detect them on the outskirts of our galaxy. They are relatively young - younger than 400 million years - so we can find them near their birthplaces.“造父变星是黯淡的超巨星,其色度是太阳光的100到一万倍,因此 我们可以在银河系的外场观察到他们。他们组成的時间较为较短,接近4亿年,因此 能够在其起源地周边找寻他们。

银河系

”The astronomers tracked the Cepheids using the Warsaw Telescope located in the Chilean Andes.天文学家用以位于智力安第斯山的华沙望眼镜追踪造父变星。These stars pulsate at regular intervals and can be seen through the galaxys immense clouds of interstellar dust that can make dimmer stellar bodies hard to spot.这种恒星有规律性地再次出现脉动饮料,能够运用星系中巨大的星际帝国尘埃云看到,这种尘埃云不容易使偏暗的恒星体难以被寻找。

The map showed that the galaxys disk, far from flat, is significantly warped and varies in thickness from place to place, with increasing thickness measured further from the galactic center.这张地图说明,银河系的星系盘不是平面图状,而明显是歪斜的,且各部薄厚不一,间距星系管理中心就越远方就越薄。The disk boasts a diameter of about 14,000 light years. Each light year is about 6 trillion miles (9 trillion km).银河系星系盘的直径为1.4万亿光年。每亿光年约有六万亿公里(9万亿元千米)。The Milky Way began to form relatively soon after the Big Bang explosion that marked the beginning of the universe some 13.8 billion years ago.银河系是在约138亿光年前宇宙膨胀后直接刚开始组成的。

宇宙膨胀意味着宇宙的起源。The sun, located roughly 26,000 light years from the supermassive black hole residing at the center of the galaxy, formed about 4.5 billion years ago.太阳光组成于约45亿光年前,间距位于星系管理中心的超大型品质超级黑洞大概2.六万亿光年。


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