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#galaxy

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Composite image of Arp 16, also known as M66.

Includes X-ray data from Chandra (blue), infrared from Spitzer (red), and visible light from Hubble and the Very Large Telescope (yellow). The inset shows a bright central X-ray source, likely material falling onto a supermassive black hole.

Credit: NASA, STScI, JPL-Caltech, ESO, WFI, CXC, Ohio State Univ., C.Grier et al
Source: chandra.harvard.edu/photo/2012

Image of Arp 297, also known as NGC 5755, NGC 5753, NGC 5754 and NGC 5752, from the Atlas of Peculiar Galaxies by Halton Arp (1966).

In the original catalog, it was in the category: Double and multiple galaxies - Long filaments. While the left and right pairs of galaxies are interacting with their companions, the pairs are unrelated and are at different distances.

Source: ned.ipac.caltech.edu/level5/Ar

Hubble Space Telescope image of Arp 6, also known as NGC 2537 or the Bear’s Paw Galaxy.

NGC 2537 has a nucleus that is rapidly forming stars, surrounded by a horseshoe-shaped structure that is also forming new stars. Since the stars in the nucleus are older, the horseshoe may be the result of a shockwave sent out by the nuclear starburst.

Credit: NASA, ESA, STScI, J. Dalcanton, Judy Schmidt
Source: flickr.com/photos/geckzilla/46