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Hoag’s Object is a Galaxy within a Galaxy within a Galaxy & nobody knows why…

Ring Galaxies account for less than 0,1% of all known galaxies, and so they aren't the easiest objects to study

Newsroom December 4 11:03

Look closely at the serpent constellation slithering through the northern sky, and you might see a galaxy within a galaxy within a galaxy.

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This cosmic turducken is known as Hoag’s object, and it has befuddled stargazers since astronomer Arthur Hoag discovered it in 1950.

The object in question is a rare, ring-shaped galaxy measuring some 100,000 light-years across (slightly larger than the Milky Way) and located 600 million light-years from Earth. In a recent image of the oddball object taken by the Hubble Space Telescope and processed by geophysicist Benoit Blanco, a bright ring of billions of blue stars forms a perfect circle around a much smaller and denser sphere of reddish stars. In the dark gap between the two stellar circles, another ring galaxy — much, much farther away from us — peeks out to say hello.

Read more: space

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