Ring galaxy
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A ring galaxy is a type of galaxy that includes a large annular structure. The galactic center may be relatively separate from the ring structure, or present a continuous disc shape. Hoag's Object, di
Hoag's Object, a ring galaxy. Another red ring galaxy can be seen behind it.
Vela ring galaxy, and a bright star known as HD 88170.
Ring Galaxy - II Zwicky 28
Image of AM 0644-741 by the Hubble Space Telescope (HST)
Polar-ring galaxy
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A polar-ring galaxy is a type of galaxy with an outer ring of gas and stars that rotates over the poles of the galaxy. These polar rings are thought to form when two galaxies gravitationally interact
Ring galaxy
…inflowing gas, extending far from the visible luminous galactic disc. If conditions are favorable, a ring can form in the place of a spiral structure. Polar-ring galaxies may form through cold accretion, as gas from the galaxy filament flows into the disk and halo regions of a galaxy early in evolution. Resulting star…
NGC 660 showing polar-galaxy structure
NGC660 polar galaxy. 24-inch telescope on Mt. Lemmon, AZ.
NGC 2685, HST
NGC 3718 HST