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The cartwheel galaxy, galaxy pair AM 2026-424, and Arp 147 are all examples of ring galaxies believed to be formed from this process. In pass-through galactic collisions, an often smaller galaxy will pass through the disc of an often larger spiral, causing an outward push of the arms, as if dropping a rock into a pond of still water.
A ring galaxy is a galaxy with a circle-like appearance. Hoag's Object, discovered by Arthur Hoag in 1950, is an example of a ring galaxy. [1] The ring contains many massive, relatively young blue stars, which are extremely bright. The central region contains relatively little luminous matter. Some astronomers believe that ring galaxies are ...
The ring structure is so perfect and circular that it has been referred to as "The most perfect ring galaxy". [7] The diameter of the 6 arcsecond inner core of the galaxy is about 17 ± 0.7 kly ( 5.3 ± 0.2 kpc ) while the surrounding ring has an inner 28″ diameter of 75 ± 3 kly ( 24.8 ± 1.1 kpc ) and an outer 45″ diameter of 121 ± 4 kly ...
NGC 1291, also known as NGC 1269, [4] is a ring galaxy with an unusual inner bar and outer ring structure located about 33 million light-years away in the constellation Eridanus. [1] It was discovered by James Dunlop in 1826 and subsequently entered into the New General Catalogue as NGC 1291 by Johan Ludvig Emil Dreyer .
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