File:Milky_Way_2005.jpg
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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 | |
來源 | NASA/JPL (http://www.nasa.gov/mission_pages/spitzer/multimedia/20080603a.html) |
作者 | R. Hurt |
授權許可 (重用此檔案) |
Created by NASA; public domain |
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本作品由NASA創作,屬於公有領域。根據NASA的版權政策:“NASA的創作除非另有聲明否則不受版權保護。”(參見:Template:PD-USGov/zh,NASA版權政策或JPL圖像使用政策) | ||
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日期/時間 | 縮圖 | 尺寸 | 使用者 | 備註 | |
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目前 | 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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