SDSS image of Arp 82, also known as NGC 2535 and NGC 2536.

Simulations suggest the two galaxies are in the early stages of a merger. The pair already experienced one collision and are just about to collide again.

The larger galaxy's inner arms have evenly spaced "beads on a string" star clusters. This suggests the recent gravitational interactions created shocks that led to a burst of star formation.

Credit: SDSS
Source: https://www.legacysurvey.org/viewer?ra=122.8074&dec=25.2048&layer=sdss&zoom=13

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Hubble image of Arp 188, also known as the Tadpole Galaxy.

Seen shining through the Tadpole's disk, a tiny blue intruder galaxy likely caused the Tadpole's distorted shape. Gravitational interactions created the long tail of debris, stars and gas that stretch out more than 280,000 light-years.

Credit: NASA, ESA, H. Ford (JHU), G. Illingworth (UCSC/LO), M.Clampin and G. Hartig (STScI), ACS Science Team
Source: https://science.nasa.gov/asset/hubble/the-tadpole-galaxy-distorted-victim-of-cosmic-collision/

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Image of Arp 282, also known as NGC 169 and NGC 169A, from the Atlas of Peculiar Galaxies by Halton Arp (1966).

In the original catalog, it was in the category: Double and multiple galaxies - Infall and attraction. NGC 169 (left) and NGC 169A (right) are interacting, creating streams of stars, gas and dust that visibly link the pair of galaxies.

Source: https://ned.ipac.caltech.edu/level5/Arp/Arp71.html

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Planewave CDK24 image of Arp 225, also known as NGC 2655.

NGC 2655 is a giant lenticular galaxy, a galaxy that has a disk but not spiral arms. The outer ripples may be the result of a recent merger with a smaller galaxy.

Credit: KuriousGeorge, Wikimedia Commons
Source: https://commons.wikimedia.org/wiki/File:NGC2655_S1_Crop_CB_HVLG_Crop_VBNR_GE_SCR_LHE2_CR505050100_SS2083_Levels.jpg

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Multiwavelength image of Arp 26, also known as M101 or the Pinwheel Galaxy.

This is a composite of views from Spitzer (red), Hubble (yellow), and Chandra (blue).

Spitzer's infrared light emphasizes dust, Hubble's visible light highlights stars, and Chandra's X-ray view shows hot objects like gas and black holes.

Credit: NASA, ESA, CXC, SSC, and STScI
Source: https://science.nasa.gov/asset/hubble/nasas-great-observatories-celebrate-the-international-year-of-astronomy/

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ALMA and Hubble image of Arp 220, also known as IC 4553.

A merger of two spiral galaxies set of a burst of star formation, backlighting the dust lanes in the Hubble visible light view.

The red dots are millimeter wavelength light from ALMA, showing emission from molecules like water in two compact star clusters, the remnant cores of the spiral galaxies.

Credit: ALMA(ESO/NAOJ/NRAO), NASA, ESA, and The Hubble Heritage Team
Source: https://www.eso.org/public/images/eso1645a/

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Kitt Peak image of Arp 184, also known as NGC 1961.

NGC 1961 is an extremely massive spiral galaxy with irregular arms. Normally, its shape would indicate an interaction or merger with another galaxy. However, no companion galaxy has been detected. Instead, it may have been distorted through interactions with the gas in its galaxy cluster.

Credit: KPNO, NOIRLab, NSF, AURA, D. Matthews, A. Block
Source: https://noirlab.edu/public/images/noao-n1961matthews/

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VLT image of Arp 16, also known as M66.

The glittering image of M66 was taken with the Multi-Unit Spectroscopic Explorer (MUSE) on ESO’s Very Large Telescope (VLT) in Chile.
The image highlights the galaxy's warm gas, with hydrogen (red), oxygen (blue), and sulfur (orange). It was taken as part of the PHANGS survey.

Credit: ESO, PHANGS
Source: https://www.eso.org/public/images/potw2218a/

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Image of Arp 302, also known as UGC 9618 or VV 340, from the Atlas of Peculiar Galaxies by Halton Arp (1966).

In the original catalog, it was in the category: Double and multiple galaxies - Unclassified objects. Arp 302 consists of a pair of very gas-rich spiral galaxies in the early stages of an interaction.

Source: https://ned.ipac.caltech.edu/level5/Arp/Arp76.html

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Hubble and Dark Energy Camera image of Arp 122, also known as NGC 6040 and LEDA 59642.

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.

Credit: ESA, NASA, J. Dalcanton, Dark Energy Survey, DOE, FNAL, DECam, CTIO, NOIRLab, NSF, AURA
Source: https://esahubble.org/images/potw2402a/

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