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Fayl:NGC-4555.jpg

NGC-4555.jpg (576 × 463 piksel, fayl hajmi: 176 KB, MIME tipi: image/jpeg)

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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)

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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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Fayl tarixi

Faylning biror paytdagi holatini koʻrish uchun tegishli sana/vaqtga bosingiz.

Sana/VaqtMiniaturaOʻlchamlariFoydalanuvchiIzoh
joriy07:32, 2010-yil 15-noyabr07:32, 2010-yil 15-noyabr dagi versiya uchun tasvir576 × 463 (176 KB)GarrondoHigher quality. Adequate source
01:38, 2007-yil 21-iyun01:38, 2007-yil 21-iyun dagi versiya uchun tasvir324 × 271 (54 KB)RedAndrNGC 4555 galaxy http://rst.gsfc.nasa.gov/Sect20/ngc4555.jpg

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