File:Milky_Way_2005.jpg
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原始文件 (1,350 × 1,350像素,文件大小:955 KB,MIME类型:image/jpeg)
摘要
本文件已被Artist’s impression of the Milky Way.jpg取代。建议您使用其他文件。请注意,删除被取代的图片需要达成一致。
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描述Milky Way 2005.jpg |
Caption from NASA: Like early explorers mapping the continents of our globe, astronomers are busy charting the spiral structure of our galaxy, the Milky Way. Using infrared images from NASA's Spitzer Space Telescope, scientists have discovered that the Milky Way's elegant spiral structure is dominated by just two arms wrapping off the ends of a central bar of stars. Previously, our galaxy was thought to possess four major arms. This artist's concept illustrates the new view of the Milky Way, along with other findings presented at the 212th American Astronomical Society meeting in St. Louis, Mo. The galaxy's two major arms (Scutum-Centaurus and Perseus) can be seen attached to the ends of a thick central bar, while the two now-demoted minor arms (Norma and Sagittarius) are less distinct and located between the major arms. The major arms consist of the highest densities of both young and old stars; the minor arms are primarily filled with gas and pockets of star-forming activity. The artist's concept also includes a new spiral arm, called the "Far-3 kiloparsec arm," discovered via a radio-telescope survey of gas in the Milky Way. This arm is shorter than the two major arms and lies along the bar of the galaxy. Our sun lies near a small, partial arm called the Orion Arm, or Orion Spur, located between the Sagittarius and Perseus arms. |
日期 | |
来源 | NASA/JPL (http://www.nasa.gov/mission_pages/spitzer/multimedia/20080603a.html) |
作者 | R. Hurt |
授权 (二次使用本文件) |
Created by NASA; public domain |
其他版本 |
Derivative works of this file:
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许可协议
Public domainPublic domainfalsefalse |
本文件完全由NASA创作,在美国属于公有领域。根据NASA的版权方针,NASA的材料除非另有声明否则不受版权保护。(参见Template:PD-USGov/zh、NASA版权方针页面或JPL图片使用方针。) | ||
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描绘内容
3 6 2008
媒体类型 简体中文(已转写)
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文件历史
点击某个日期/时间查看对应时刻的文件。
日期/时间 | 缩略图 | 大小 | 用户 | 备注 | |
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当前 | 2014年4月19日 (六) 21:55 | 1,350 × 1,350(955 KB) | SenseiAC | different image = different name. The "newer" one will therefore be moved to "Milky Way 2008" | |
2008年6月4日 (三) 20:47 | 5,600 × 5,600(4.35 MB) | Ashill | {{Information |Description= Like early explorers mapping the continents of our globe, astronomers are busy charting the spiral structure of our galaxy, the Milky Way. Using infrared images from NASA's Spitzer Space Telescope, scientists have discovered th | ||
2005年9月16日 (五) 08:01 | 1,350 × 1,350(955 KB) | Shizhao | Barred Spiral Milky Way Illustration Credit: R. Hurt (SSC), JPL-Caltech, NASA From http://apod.gsfc.nasa.gov/apod/ap050825.html {{PD-USGov-NASA}} |
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