Helix Nebula Model (Illustration) : 無料・フリー素材/写真
Helix Nebula Model (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 | In images, the Helix Nebula — a gaseous envelope ejected by a dying, Sun-like star — resembles a colorful donut. But Hubble Space Telescope observations show that the Helix's structure is much more complex, consisting of two disks nearly perpendicular to each other. Using Hubble's data of the Helix, astronomers created a three-dimensional model showing the two disks. Astronomers think the disks formed during two separate epochs of mass loss by the dying star. The inner disk was formed about 6,600 years ago; the outer ring, about 12,000 years ago. The inner disk is expanding slightly faster than the outer disk. For more information, visit: hubblesite.org/contents/news-releases/2004/news-2004-32.htmlCredit: NASA, ESA, and G. Bacon (STScI) |
| 撮影日 | 2019-09-25 14:50:45 |
| 撮影者 | NASA Hubble |
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