Hoag's object



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English: Hoag's Object. "Is this one galaxy or two? This question came to light in 1950 when astronomer Art Hoag chanced upon this unusual extragalactic object. On the outside is a ring dominated by bright blue stars, while near the center lies a ball of much redder stars that are likely much older. Between the two is a gap that appears almost completely dark. How Hoag's Object formed remains unknown, although similar objects have now been identified and collectively labeled as a form of ring galaxy. Genesis hypotheses include a galaxy collision billions of years ago and perturbative gravitational interactions involving an unusually shaped core. The above photo taken by the Hubble Space Telescope in July 2001 reveals unprecedented details of Hoag's Object and may yield a better understanding. Hoag's Object spans about 100,000 light years and lies about 600 million light years away toward the constellation of Serpens. Coincidentally, visible in the gap (at about one o'clock) is yet another ring galaxy that likely lies far in the distance."
Date July 2001(2001-07)
Author R. Lucas (STScI/AURA), Hubble Heritage Team, NASA
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Public domain This file is in the public domain because it was 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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EXIF data:
File name hoag_s_object.jpg
Size, bytes 410384
Mime type image/jpeg
Orientation of image 1
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Image resolution in height direction 253/1
Unit of X and Y resolution 2
Color space information 65535
Exif image width 1521
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Software used Adobe Photoshop 7.0
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