Disk of Blue Stars Around Andromeda's Core (Illustration) : 無料・フリー素材/写真
Disk of Blue Stars Around Andromeda's Core (Illustration) / NASA Hubble
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | This artist's concept shows a view across a disk of young, blue stars encircling a supermassive black hole at the core of the neighboring Andromeda Galaxy (M31). The region around the black hole is barely visible at the center of the disk. The background stars are the typical older, redder population of stars that inhabit the cores of most galaxies. Using the Hubble Space Telescope, astronomers discovered a mysterious source of blue light at the center of the Andromeda Galaxy in 1995. Three years later, additional Hubble observations indicated that the blue light came from a cluster of blue stars. More recently, observations by Hubble's Space Telescope Imaging Spectrograph (STIS) reveal that the blue light consists of more than 400 stars that formed in a burst of activity about 200 million years ago. The stars are tightly packed in a disk that is only a light-year across. Under the black hole's gravitational grip, the stars are traveling very fast: 2.2 million miles an hour (3.6 million kilometers an hour).For more information, visit: hubblesite.org/contents/news-releases/2005/news-2005-26.htmlCredit: NASA, ESA, and A. Schaller (for STScI) |
| 撮影日 | 2019-09-25 10:45:51 |
| 撮影者 | NASA Hubble |
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