Spiral Galaxy NGC 5584 : 無料・フリー素材/写真
Spiral Galaxy NGC 5584 / 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 | The brilliant, blue glow of young stars traces the graceful spiral arms of galaxy NGC 5584 in this image from Hubble’s Wide Field Camera 3. Thin, dark dust lanes appear to be flowing from the yellowish core, where older stars reside. The reddish dots sprinkled throughout the image are largely background galaxies.Among the galaxy's myriad stars are pulsating stars called Cepheid variables and one recent Type Ia supernova, a special class of exploding stars. Cepheid variables pulsate at a rate matched closely by their intrinsic brightness, making them ideal for measuring distances to relatively nearby galaxies. Type Ia supernovas likewise flare with an intrinsic brightness that is known, though much greater, permitting their use to help gauge larger distances. Astronomers search for Type Ia supernovas in nearby galaxies containing Cepheid variables so they can identify the true brightness of both types of stars. They then use that information when viewing Type Ia supernovas in far-flung galaxies to estimate their distance from Earth.For more information, visit: hubblesite.org/image/2824/category/112-hubble-heritageCredit: NASA, ESA, A. Riess (STScI/JHU), L. Macri (Texas A&M University), and the Hubble Heritage Team (STScI/AURA)Find us on Twitter, Instagram, Facebook and YouTube |
| 撮影日 | 2011-02-28 09:45:44 |
| 撮影者 | NASA Hubble |
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