Dosya:NGC-4555.jpg

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NGC-4555.jpg ‎(576 × 463 pikselan, ebatê dosya: 176 KB, MIME tipê cı: image/jpeg)

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Xulasa

X-ray/Optical Composite of NGC 4555

Dark matter continues to confound astronomers, as NASA's Chandra X-ray Observatory demonstrated with the detection of an extensive envelope of dark matter around an isolated elliptical galaxy. This discovery conflicts with optical data that suggest a dearth of dark matter around similar galaxies, and raises questions about how galaxies acquire and keep such dark matter halos. (Description from http://chandra.harvard.edu/photo/2004/ngc4555/more.html#ngc4555_comp)

Scale: Image is 8 x 6.5 arcmin per side.

http://chandra.harvard.edu/photo/2004/ngc4555/more.html#ngc4555_comp

(Credit: X-ray: NASA/CXC/E.O'Sullivan et al.; Optical: Palomar DSS)

Lisans

Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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Tarix/ZemanResımo qıckekEbadiKarberMışewre
nıkayên07:32, 15 Tışrino Peyên 2010Seba versiyonê 07:32, 15 Tışrino Peyên 2010 ra576 - 463 (176 KB)GarrondoHigher quality. Adequate source
01:38, 21 Hezirane 2007Seba versiyonê 01:38, 21 Hezirane 2007 ra324 - 271 (54 KB)RedAndrNGC 4555 galaxy http://rst.gsfc.nasa.gov/Sect20/ngc4555.jpg

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