Spitzer, Hubble, and Chandra image of Arp 26, also known as M101 or the Pinwheel Galaxy.

In the infrared light Spitzer view we see a network of yellow-green of dust lanes. In the visible light Hubble view, the dust is dark and blue star clusters dot the spiral arms. In the X-ray Chandra view, we see million-degree gas, supernova remnants, neutron stars, and black holes.

Credit: NASA, ESA, CXC, JPL, Caltech, STScI
Source: https://www.spitzer.caltech.edu/image/ssc2009-03b-spiral-galaxy-m101-nasas-great-observatories

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Hubble Space Telescope image of Arp 147, also known as IC 298.

The clumpy, blue ring in the galaxy on the right likely formed when the companion galaxy to the left crashed through its center. This sent a pressure wave outward, like a ripple in a pond, compressing the right galaxy's gas and triggering the formation of new stars.

Credit: NASA, ESA, and M. Livio (STScI)
Source: https://science.nasa.gov/asset/hubble/interacting-galaxies-arp-147/

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Hubble image of Arp 194, also known as UGC 6945.

The upper component of this interacting galaxy group has two nuclei that appear to be connected and in the early stages of merging along with trails of blue super star clusters. The lower component of the group is a single large spiral galaxy with its own star clusters.

Credit: NASA, ESA, and the Hubble Heritage Team
Source: https://science.nasa.gov/asset/hubble/interacting-galaxies-group-arp-194/

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GALEX image of Arp 286, also known as NGC 5560, NGC 5566, and NGC 5569.

This ultraviolet image shows the youngest, hottest stars in the interacting galaxy triplett. NGC 5566 is the large spiral in the center. The small blue spiral galaxy to the bottom left is NGC 5569. The spiral galaxy to the top left is NGC 5560. Its distorted shape is likely due to interactions with NGC 5569.

Credit: NASA, JPL-Caltech
Source: http://www.galex.caltech.edu/media/glx2006-03r_img04.html

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Hubble image of Arp 298, also known as NGC 7469 and IC 5283.

NGC 7469, a face-on spiral galaxy, and its companion galaxy IC 5283, seen to the upper right, form an interacting pair.

IC 5283 shows signs of significant gravitational perturbations caused by its companion, including a tidal tail dotted with young, blue star clusters that trails off to the right.

Credit: ESA, NASA, A. Evans, R. Chandar
Source: https://esahubble.org/images/potw2208a/

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Very Large Telescope image of Arp 271, also known as NGC 5426 and NGC 5427.

This pair of interacting galaxies was the final image captured by the VIsible Multi-Object Spectrograph (VIMOS) instrument before it was decommissioned on 24 March 2018.

Credit: ESO, Juan Carlos Muñoz
Source: https://www.eso.org/public/images/potw1821a/

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Image of Arp 82, also known as NGC 2535 and NGC 2536, from the Atlas of Peculiar Galaxies by Halton Arp (1966).

In the original catalog, it was in the category: Spiral galaxies - Large, high surface brightness companions. The larger galaxy's inner arms have evenly spaced "beads on a string" star clusters, suggesting recent gravitational interactions between the galaxy pair led to a burst of star formation.

Source: https://ned.ipac.caltech.edu/level5/Arp/Arp21.html

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Image of Arp 122, also known as NGC 6040 and LEDA 59642, from the Atlas of Peculiar Galaxies by Halton Arp (1966).

In the original catalog, it was in the category: Elliptical galaxies - Close to and perturbing spiral galaxies. This pair of galaxies NGC 6040, the tilted, warped spiral galaxy and LEDA 59642, the round, face-on spiral are in the midst of a collision.

Source: https://ned.ipac.caltech.edu/level5/Arp/Arp31.html

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Image of Arp 8, also known as NGC 497, from the Atlas of Peculiar Galaxies by Halton Arp (1966).

In the original catalog, it was in the category: Spiral galaxies - Split arms. NGC 497 is a barred spiral galaxy about 370 million light years away in the constellation Cetus.

Source: https://ned.ipac.caltech.edu/level5/Arp/Arp2.html

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Hubble image of Arp 283, also known as NGC 2798 and NGC 2799.

The left galaxy in this interacting pair, NGC 2799, is viewed edge-on. A bridge of star forming regions appears to connect it to its companion on the right, NGC 2798. NGC 2798 has two broad smooth spiral arms or tails without obvious clumps, made of mostly older, yellow stars.

Credit: ESA, NASA, J. Dalcanton, J. Schmidt
Source: https://www.flickr.com/photos/geckzilla/48172263957

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