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ALMA and Hubble image of Arp 220, also known as IC 4553. Dust blocks the center of a galaxy merger in the Hubble visible light view. However, ALMA sees two compact cores in millimeter wavelength light (red). Credit: ALMA(ESO/NAOJ/NRAO), NASA, ESA, and The Hubble Heritage Team Source

A section of the center of a pair of merging galaxies. The image is dominated by brown dust, which forms a blotchy diagonal band that runs from upper right to lower left. It is backlit by the bright light from the center of the galaxies. In the background are blue stars and star clusters, seen as a grainy blue background interspersed with blue dots. In the center are two bright red dots. The top one is brighter and the lower one is slightly fainter.

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Arp Bot 🤖 @arpbot.bsky.social · 20h

VLT image of Arp 289, also known as NGC 3981. This image was captured as part of the ESO Cosmic Gems Program, which uses the Very Large Telescope to photograph beautiful objects in the southern skies when conditions don’t allow scientific observations to be made. Credit: ESO Source

The yellow core of a disrupted spiral galaxy is surrounded by irregular, translucent spiral arms. The inner part of the galaxy is seen at an angle, so that it appears oval-shaped rather than circular. Dark brown dust lanes and pink star forming regions cross a yellow haze of older stars. The faint blue arms unfurl from the center, like paint flung out of a spinning canvas. They are dotted with blue star clusters. The arms stretch out to the right of the frame. The black background of space is filled with foreground stars and tiny background galaxies.

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Arp Bot 🤖 @arpbot.bsky.social · 29/09/2026

Image of Arp 15, also known as NGC 7393, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Spiral galaxies - Detached segments. It is a barred spiral galaxy in the constellation Aquarius. Source

A grainy, black and white image of a nearly face-on spiral galaxy. Several white dots, which are stars, are seen on the black background.

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Arp Bot 🤖 @arpbot.bsky.social · 29/09/2026

Hubble Space Telescope image of Arp 25, also known as NGC 2276. The lopsided galaxy has a core offset to the upper left and a spiral arm separated from the others. It is interacting with a nearby galaxy, just out of frame. Credit: NASA, ESA, STScI, P. Sell Source

Against the black background of space, which has distant stars and galaxies scattered across, is a large spiral galaxy filled with streaks of blue and pink. The galaxy has warped spiral arms that wrap clockwise around its bright yellow core. Toward the upper right, one of its arms appears to be breaking away from the rest of the galaxy.

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Arp Bot 🤖 @arpbot.bsky.social · 28/09/2026

Image of Arp 302, also known as UGC 9618 or VV 340, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Double and multiple galaxies - Unclassified objects. The pair is beginning to interact. Source

A grainy, black and white image of a pair of spiral galaxies. The lower galaxy is seen face-on. It has a bright center that transitions into a series of loosely-wound spiral arms, looking something like a cinnamon roll. The arms are dotted with star clusters . The upper galaxy is seen edge on. It has a somewhat puffy disk, seen as a wide, vertical line. Together, the two galaxies look like an exclamation point. In the middle of the frame, where the two galaxies appear to touch, is a bright foreground star seen as a large dot. A few white dots, which are stars, are seen on the black background.

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Arp Bot 🤖 @arpbot.bsky.social · 28/09/2026

Image of Arp 30, also known as NGC 6365, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Spiral galaxies - One heavy arm. This is actually a pair of galaxies, one face-on and one edge-on. Source

A grainy, black and white image of a pair of spiral galaxies, one seen nearly edge-on and one seen face-on. The face-on spiral at bottom has a bright central core and two well-defined spiral arms that loop counterclockwise around the galaxy. The outer arms are dotted with star clusters. One spiral arm begins at about 6 o'clock, curls around to the top of the galaxy at 12 o'clock and then ends at the bottom of the galaxy around 6 o'clock. The second arm begins at around 12 o'clock and curls around, ending at around 3 o'clock. The nearly edge-on galaxy overlaps at the top of the face-on galaxy, appearing like a continuation of the face-on galaxy's second spiral arm. It's disk is tilted, so it appears as a long, thin oval rather than a circle. The galaxy also has a bright central core and an outer edge dotted with star clusters. A few white dots, which are stars, are seen on the black background.

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Arp Bot 🤖 @arpbot.bsky.social · 27/09/2026

NTT image of Arp 22, also known as NGC 4027. NGC 4027 is a barred spiral galaxy with a single spiral arm. It is interacting with a smaller companion galaxy, NGC 4027A, which is just out of frame. Credit: ESO Source

A face-on spiral galaxy. In the center is a small yellow bar structure. A single large blue spiral arm begins at the top and curves counter-clockwise from about the 12 o'clock to 11 o'clock positions. This gives the galaxy a teardrop-shape with a curved end, so that it resembles a paisley. Brown dust lanes, blue star clusters, and pink star forming regions are scattered throughout the galaxy.

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Arp Bot 🤖 @arpbot.bsky.social · 27/09/2026

Hubble image of Arp 82, also known as NGC 2535 and NGC 2536. The larger galaxy's arms have evenly spaced "beads on a string" star clusters, created by recent gravitational interactions that led to a burst of star formation. Credit: NASA, ESA, STScI, J. Dalcanton, Judy Schmidt Source

$A black and white image of a pair of interacting spiral galaxies. In the center of the frame is the larger galaxy, a barred spiral galaxy seen face-on. It has a bright center that transitions into a small bar, crossed by filamentary, dark dust lanes. A ring of stars and star clusters circles the bar, giving the inner part of the galaxy a shape that resembles an eye. Two long spiral arms emerge from the ring, dotted with bright star clusters and outlined by dust filaments, forming an S-shape. The upper arm trails off in a faint arc to the right. The bottom arm appears to connect to its companion galaxy in the lower part of the frame. This galaxy is smaller and less well defined, but is still clearly a two-armed spiral with a bright center and wider, hazy arms. The black background of space is dotted with foreground stars and tiny background galaxies. A few particularly bright stars with diffraction spikes are seen to the right of the center galaxy.$

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Arp Bot 🤖 @arpbot.bsky.social · 26/09/2026

JWST MIRI image of Arp 107, also known as UGC 5984. In this pair of interacting galaxies, only the one-armed spiral glows brightly in mid-infrared light. Young, forming stars surrounded by dusty silicates and soot-like molecules glow in blue. Credit: NASA, ESA, CSA, STSc Source

$A pair of interacting galaxies. The larger of the two is slightly right of center. It is a one-armed spiral galaxy with a hazy, bright, white center and a ring of blue, gaseous filaments. The center of this galaxy shows JWST’s eight-pronged diffraction pattern. The single spiral arm begins at about the 7 o'clock position and spirals counterclockwise to the 12 o'clock position, forming a ring structure. Toward the bottom left and right of the ring are filaments of gas spiraling inward toward the core. At the top left of the ring is a noticeable gap, bordered by two large, blue pockets of dust and gas. The smaller galaxy is made of hazy, light blue gas and dust. Many red, green, blue, and yellow galaxies are spread throughout, with some being hazier in composition and others having more defined spiral patterns.$

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Arp Bot 🤖 @arpbot.bsky.social · 26/09/2026

Hubble NICMOS image of Arp 220, also known as IC 4553. This infrared image shows two compact star clusters in the center of Arp 220. They are the remnant cores of two spiral galaxies that are in the process of merging. Credit: NASA, ESA, STScI, R. Thompson, N. Scoville Source

The center of a galaxy merger. A roughly circular blue-white area is crossed by a diagonal band of dark brown dust. In the center are two bright yellow-white blobs, which are star clusters. The left blob is partially covered by the dust band.

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Arp Bot 🤖 @arpbot.bsky.social · 25/09/2026

Hubble image of Arp 22, also known as NGC 4028. NGC 4027 is a barred spiral galaxy with a single spiral arm. It is interacting with a smaller companion galaxy, NGC 4027A, just out of frame. Credit: NASA, ESA, STScI, Julianne Dalcanton, Meli thev, Wikimedia Commons Source

A greyscale image of face-on spiral galaxy. In the center is a small bar structure. A single large blue spiral arm begins at the top and curves counter-clockwise from about the 11 o'clock to 9 o'clock positions. This gives the galaxy a teardrop-shape with a curved end, so that it resembles a paisley. Dark dust lanes, star clusters are scattered throughout the galaxy.

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Arp Bot 🤖 @arpbot.bsky.social · 25/09/2026

Hubble image of Arp 200, also known as NGC 1134. NGC 1134 is likely interacting with its small companion, seen to the lower right, producing streamers of stars that trail off to the right. Credit: NASA, ESA, STScI, Julianne Dalcanton, Meli thev, Wikimedia Commons Source

A greyscale image of a face-on spiral galaxy. The faint galaxy has a bright core, a small oval-shaped ring, and two loose spiral arms that emerge from the ring and wind counterclockwise around the galaxy. The arms are crossed by dark dust lanes and dotted with bright star clusters. At the bottom right edge of the galaxy is a smaller elliptical galaxy, seen as a bright dot surrounded by an oval-shaped haze. Faint, hazy, lines of stars appear from the point where the two galaxies overlap and stream off diagonally, down and to the right. The image has a noticeable amount of detector noise which has not been removed.

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Arp Bot 🤖 @arpbot.bsky.social · 24/09/2026

Kitt Peak National Observatory image of Arp 336, also known as NGC 2685. NGC 2685 is a polar ring galaxy. It has a ring of gas, stars, and dust that orbits perpendicular to the plane of the galaxy, seen as unusual whorls, or helical filaments. Credit: NOIRLab, AURA, NSF Source

A lenticular galaxy has an pale yellow central core that forms a fuzzy bar structure. Surrounding this a faint almond-shaped area. Together, they somewhat resemble an eye. Several faint, brown, slightly curved dust lanes cross the galaxy vertically on its left half. The black background of space is dotted with stars and smaller galaxies.

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Arp Bot 🤖 @arpbot.bsky.social · 24/09/2026

Image of Arp 140, also known as NGC 274 and NGC 275, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Elliptical galaxies - Emanating material. The pair is a barred spiral and lenticular galaxy. Source

A grainy, black-and-white image of a two side-by-side galaxies. The left galaxy is a bright spiral galaxy with star clusters, crossed by dark dust lanes.. The right galaxy is a lenticular galaxy. It bright white center that gradually becomes more transparent near the edges, emitting a hazy glow. A few white dots, which are stars, are seen on the black background.

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Arp Bot 🤖 @arpbot.bsky.social · 23/09/2026

JWST image of Arp 269, also known as NGC 4485 and NGC 4490. NGC 4490 (bottom left) and NGC 4485 (top right), are interacting dwarf galaxies. They are connected by a bridge of red gas and stars. Credit: ESA, NASA, CSA, A. Adamo, G. Bortolini, FEAST JWST team Source

Horizontal image shows two interacting galaxies forming a large, wide V shape. NGC 4490 occupies the left side of the image, while NGC 4485 appears as a white glowing hue in the top right of the field. Both galaxies are connected by a bright stream of red stretching from the top left of the image, through the bottom center, and ending at the right under galaxy NGC 4485. There are regions of bright blue gas visible in concentrated areas of the red stream. The background is black with multiple galaxies in various shapes throughout

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Arp Bot 🤖 @arpbot.bsky.social · 23/09/2026

Chandra and Hubble image of Arp 302, also known as UGC 9618 or VV 340. The Chandra data (pink) shows that the upper galaxy has an obscured, active supermassive black hole. Credit: NASA, CXC, IfA, D.Sanders et al, STScI, NRAO, A.Evans et al Source

$A pair of spiral galaxies. The lower galaxy is seen face-on. It has a bright center and short bar structure that transitions into a series of loosely-wound spiral arms, looking something like a cinnamon roll. The arms are dotted with blue star clusters and crossed by darker dust filaments. A diffuse pink glow covers the center of the galaxy. The upper galaxy is seen edge on. It has a somewhat puffy disk, seen as a wide, vertical line. Running down the middle is a dark dust lane. A bright pink glow fills the center of the galaxy, extending beyond the disk. In the middle of the frame, where the two galaxies appear to touch, is a bright foreground star with four diffraction spikes. Other distant galaxies and stars fill the black background of space.$

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Arp Bot 🤖 @arpbot.bsky.social · 22/09/2026

Hubble and NuStar image of Arp 299, also known as NGC 3690. In the NuSTAR image (left panel), a supermassive black hole accretes gas and glows in X-rays. The black hole is in the right galaxy of a pair (see Hubble image, right panel). Credit: NASA, JPL-Caltech, GSFC Source

A three panel image. On the left is the NuStar image, in the center is the Hubble image, and in the middle is an image where the two are overlaid.
In the left panel is a blurry, abstract image with blobs of white, pink, blue and yellow colors. The brightest area is a white blob to the lower right.
In the center panel two merging galaxies form an abstract shape, which looks a little like an upside down rubber duck. Within the "head" and "body" of the duck are crossed brown swirls, which are dust and gas. The outside of the duck is outlined with hazy yellow swirls, which are streams of stars. Near the "neck" of the duck, at the point where the two merging galaxies touch, and slightly to the right is a bright white blob, surrounded by pink blobs. This is X-ray light from NuStar, which shows emission from an active supermassive black hole in the right galaxy.
In the right panel is two merging galaxies form an abstract shape, which looks a little like an upside down rubber duck. WIthin the "head" and "body" of the dusk are blue-white dots, which are star clusters, and brown swirls, which are dust and gas. The outside of the duck is outlined with hazy yellow swirls, which are older stars.

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Arp Bot 🤖 @arpbot.bsky.social · 21/09/2026

JWST NIRCam image of Arp 142, also known as NGC 2936 and NGC 2937, or the Penguin and the Egg. The blue haze in the distorted spiral galaxy, elliptical galaxy, and the bridge connecting the two are stars. Red filaments are glowing dust. Credit: NASA, ESA, CSA, STScI Source

$Arp 142, two interacting galaxies, observed in near-infrared light. At left is NGC 2937, nicknamed the Egg. Its center is brighter and whiter. There are six diffraction spikes atop its gauzy blue layers. At right is NGC 2936, nicknamed the Penguin. Its beak-like region points toward and above the Egg. Where the eye would be is a small, opaque yellow spiral. The Penguin’s distorted arms and thin red dust lanes from the bird’s beak, back, and tail. The tail is wide and layered, like a beta fish’s tail. A semi-transparent blue hue traces the Penguin and extends from the galaxy, creating an upside-down U over top of both galaxies. At top right is another galaxy seen from the side, pointing roughly at a 45-degree angle. It is largely light blue. Its length appears approximately as long as the Egg’s height. One foreground star with large, bright blue diffraction spikes appears over top of the galaxy and another near it. The entire black background is filled with tiny, extremely distant galaxies.$

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Arp Bot 🤖 @arpbot.bsky.social · 21/09/2026

Hubble Space Telescope image of Arp 12, also known as NGC 2608. NGC 2608 is a barred spiral galaxy. Its arms are peppered by blue star clusters and red star forming regions and crossed by brown dust lanes. Credit: ESA, NASA, A. Riess et al. Source

$A face-on barred spiral galaxy fills most of the frame. It has a yellow central core and horizontal bar structure. Attached to the bar are several spiral arms which originate at the end of the bar and spiral clockwise. The arms are somewhat squished, so the galaxy appears oval-shaped, longer than it is tall. There are two foreground stars with diffraction spikes, one right above the core of the galaxy and one to the lower right. The black background of space is dotted with numerous tiny, distant galaxies.$

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Arp Bot 🤖 @arpbot.bsky.social · 20/09/2026

Hubble and Pan-STARRS image of Arp 300, also known as UGC 05028 and UGC 05029. In this image of an interacting galaxy pair, the luminosity comes from Hubble ACS/WFC observations, and color comes from Pan-STARRS. Credit: NASA, ESA, STScI, J. Dalcanton, Judy Schmidt, PanSTARRS Source

The frame is dominated by a pair of spiral galaxies. The larger galaxy to the upper left is seen nearly face-on. It has a small pale yellow core and a short bar that transitions into spiral arms that are dotted with bluish purple star clusters. More star clusters appear on the right of the galaxy, the side that faces its companion. There are a few dark dust lanes, concentrated near the inner spiral arms. The smaller spiral galaxy to the lower right has a pale yellow bar structure that is surrounded by bluish purple star clusters that only very roughly form spiral arms. On the bottom of the galaxy there is a yellow knot of stars that is brightest in its center, crossed by brown dust lanes. This may be a seperate dwarf galaxy that is either in front of the smaller spiral or is in the process of merging with it. Other distant galaxies and stars fill the black background of space.

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Arp Bot 🤖 @arpbot.bsky.social · 20/09/2026

Hubble and Legacy Survey image of Arp 282, also known as NGC 169 and NGC 169A. Interactions between the two galaxies create delicate streams that visibly link the pair. Credit: NASA, ESA, STScI, J. Dalcanton, Judy Schmidt, Legacy Surveys, D. Lang, NERSC Source

A large spiral galaxy is seen in the center of the frame. It's tilted at an angle, so that it's disk appears as an oval rather than a circle. Dramatic dust lanes cross in front of the center of the galaxy and are backlit by a haze of yellow-white stars. Below the spiral is a smaller disk galaxy seen in shades of blue white. It appears to be at almost a right angle to the large spiral, falling out of the larger galaxy. The two galaxies are connected by a bridge of dusty tendrils, which are also backlit by the main galaxy. This galaxy pair looks a lot more 3D than most interacting galaxies because of their angles and the backlighting effect.

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Arp Bot 🤖 @arpbot.bsky.social · 19/09/2026

Image of Arp 299, also known as NGC 3690, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Double and multiple galaxies - Unclassified objects. Interactions between the pair triggered a starburst. Source

A grainy, black and white image of two merging galaxies that form an abstract shape, which looks a little like a rubber duck. Within the "head" and "body" of the duck are dark swirls, which are dust and gas. The outside of the duck is outlined with hazy swirls, which are streams of stars.

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Arp Bot 🤖 @arpbot.bsky.social · 19/09/2026

Hubble image of Arp 321, also known as Hickson 40. This group of galaxies include three spiral galaxies, an elliptical galaxy, and a lenticular (lens-like) galaxy. Credit: NASA, ESA, STScI, A. Pagan Source

Five galaxies appear close to each other in the sky. At upper left, a spiral galaxy is tilted, appearing wider than it is tall. It has a glowing yellow center and reddish-brown dust trails that spiral clockwise around it. Above the center is a large elliptical galaxy. Its round, glowing yellow center is surrounded by a fuzzy yellow halo that fades away from the core. Toward the bottom right are three galaxies that appear to touch. The largest is in the center: a nearly vertical, edge-on spiral galaxy. Its glowing yellow core is mostly obscured by reddish-brown dust trails dotted with blue stars. To its bottom left is a smaller, tilted spiral galaxy with a glowing yellow center. Reddish-brown dust trails are dotted with blue stars. One spiral arm appears to touch the vertical galaxy to its right. At the spiral’s bottom right is a lenticular galaxy with a glowing central core in the middle of a hazy yellow disk, appearing almost face-on. It seems to touch the large spiral galaxy above it.

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Arp Bot 🤖 @arpbot.bsky.social · 18/09/2026

Image of Arp 11, also known as UGC 717, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Spiral galaxies - Split arms. UGC 717 is the large spiral galaxy at center. Source

A grainy, black and white image of a group of several spiral galaxies. The upper galaxy, UGC 717, has a small core, and a bar surrounded by a ring structure. On the outside of the ring are several spiral arms, including one arm that splits in two as it curves around the left side of the galaxy. The spiral in the bottom left, UGC 719, has a small core, and a bar surrounded by a ring structure. On the outside of the ring are several somewhat ill-defined spiral arms. In the background are several other smaller galaxies. Many white dots, which are stars, are seen on the black background.

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Arp Bot 🤖 @arpbot.bsky.social · 18/09/2026

Image of Arp 286, also known as NGC 5560, NGC 5566, and NGC 5569, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Double and multiple galaxies - Infall and attraction. Source

A grainy, black and white image of three spiral galaxies. The largest is at the center of the frame. The disk of the galaxy is tilted, so that it appears oval-shaped, with the long axis running diagonally from upper right to lower left. It has a bright center, surrounded by a ring structure. Emerging from the ring are two spiral arms, defined by faint dust lanes. The arms trace the outline of the oval. A faint haze of stars fills in the interior of the oval. At the bottom left is a much smaller face-on spiral galaxy. Unlike the other two galaxies in the group, this galaxy does not appear distorted. It has a small core, surrounded by a faint disk. At upper left is a distorted spiral galaxy seen nearly edge-on. Its disk is warped, forming a thin, nearly vertical, backward S-shape.

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Arp Bot 🤖 @arpbot.bsky.social · 17/09/2026

Hubble image of Arp 293, also known as NGC 6285 and NGC 6286. NGC 6285 (left) and NGC 6286 (right) have roughly equal masses. Their mutual gravitational attraction pulls streams of gas, stars, and dust from the galaxies as they interact. Credit: ESA,NASA, K. Larson et al. Source

A pair of interacting spiral galaxies. The galaxy on the left is seen nearly face-on. It has a bright central core surrounded by a disk seen in shades of pastel yellow and brown. The disk is dotted with star clusters and crossed by light brown dust lanes. At the edges of the disk are two short, faint, wide spiral arms. The galaxy on the right is seen edge-on. It's disk forms a yellow line, crossed by dark brown dust lanes. In the center of the galaxy, the circular bulge emerges on either side of the disk. The black background of space is dotted with stars and small background galaxies.

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Arp Bot 🤖 @arpbot.bsky.social · 17/09/2026

Composite image of Arp 26, also known as M101 or the Pinwheel Galaxy. X-rays from NuSTAR (green) show a supernova, on a visible light (KPNO, yellow and red) and far-UV (GALEX, blue) image of M101. Credit: NASA, JPL-Caltech, NOIRLab, NSF, AURA, B. Grefenstette, R. Hurt Source

A face-on spiral galaxy has a yellow core. Several spiral arms, dotted with blue stars and star clusters, spiral clockwise around the core. They are crossed by filamentary dust lanes. The arms are somewhat well-defined but asymmetric. One arm curls from about 3 o'clock to 7 o'clock and is mostly separated from the body of the galaxy. In this arm is a bright green dot, the location of the supernova.

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Arp Bot 🤖 @arpbot.bsky.social · 16/09/2026

Image of Arp 293, also known as NGC 6285 and NGC 6286, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Double and multiple galaxies - Wind effects. The pair's interactions pull tidal streams. Source

A grainy, black and white image of a pair of interacting spiral galaxies. The galaxy on the right is seen nearly face-on. It has a bright disk. At the edges of the disk are two short, faint, wide spiral arms. The galaxy on the left is seen edge-on. It's disk forms a line. In the center of the galaxy, the circular bulge emerges on either side of the disk. The black background of space is dotted with stars and small background galaxies. The black background of space is filled with white dots, which are foreground stars.

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Arp Bot 🤖 @arpbot.bsky.social · 16/09/2026

JWST NIRCam and MIRI image of Arp 107, also known as UGC 5984. In the near-infrared, older stars and a bridge of gas and stars between the galaxies appear in white. In the mid-infrared, star-forming regions are in orange and red. Credit: NASA, ESA, CSA, STScI Source

A pair of interacting galaxies. The larger of the two is slightly right of center. It is a one-armed spiral galaxy with a hazy, bright, white center and a ring of gaseous filaments, which are different shades of red and orange. The single spiral arm begins at about the 7 o'clock position and spirals counterclockwise to the 12 o'clock position, forming a ring structure. Toward the bottom left and right of the ring are filaments of gas spiraling inward toward the core. At the top left of the ring, at the 11 o'clock position, is a noticeable gap, bordered by two large, orange pockets of dust and gas. The smaller elliptical galaxy to its left is made of hazy white gas and dust, which becomes more diffuse farther away from its center. To this galaxy’s bottom left, there is a smaller, more diffuse gas cloud that wafts outward toward the edges. Many red, orange, and white galaxies are spread throughout the background, with some hazier in composition and others having defined spiral patterns.

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Arp Bot 🤖 @arpbot.bsky.social · 15/09/2026

Spitzer, Hubble, and Chandra image of Arp 26, also known as M101 or the Pinwheel Galaxy. Spitzer's infrared light shows dust, Hubble's visible light highlights stars, Chandra's X-rays show things like hot gas and black holes. Credit: NASA, ESA, CXC, JPL, Caltech, STScI Source

A three-panel image, showing Spitzer, Hubble, and Chandra views of the same Spiral Galaxy M101. On the left is the Spitzer view. From a small central core, several arms spiral clockwise. They are defined by a network of yellow-green filamentary dust lanes, which look somewhat like a cross section of a nautilus. The arms are dotted with pink star-forming regions and filled in with a haze of blue stars. One spiral arm curls from about 6 o'clock to 9 o'clock and is mostly separated from the body of the galaxy. The other spiral arms are less distinct. In the middle is the Hubble view. A face-on spiral galaxy has a yellow core. Several spiral arms, dotted with blue stars and star clusters, spiral clockwise around the core. They are crossed by filamentary dust lanes. The arms are somewhat well-defined but asymmetric. One arm curls from about 6 o'clock to 9 o'clock and is mostly separated from the body of the galaxy. Another arm follows more closely to the core, from about 6 o'clock to 12 o'clock. Three other arms cover the area from 12 o'clock to 6 o'clock. On the right is the Chandra view. In this panel, blue and purple splotches partially define spiral arms. These arms are smaller and less distinct than in the other views. White dots are scattered throughout the image, including a concentration of points at the galaxy's core. Credit: NASA, ESA, CXC, JPL, Caltech, STScI. ssc2009-03b

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Arp Bot 🤖 @arpbot.bsky.social · 15/09/2026

Spitzer, VLA, and CFHT MegaCam image of Arp 94, also known as NGC 3226 and NGC 3227. The grayscale image shows visible starlight. Cool hydrogen gas (blue), floods the top galaxy and shuts down star formation. Credit: NASA, CFHT, NRAO, JPL-Caltech, Duc, Cuillandre Source

Two interacting galaxies appear on a field of stars. A black and white image of the galaxies taken in visible light is overlaid with radio (blue) and infrared (pink) images. The bottom galaxy is a large spiral. It is tilted slightly, so that its disk forms an oval rather than a circle. The top galaxy is a bright elliptical galaxy. It is oval shaped with a bright center that gets gradually fainter and more transparent towards its edges. A plume of gas and stars surrounds and appears to rise from the galaxies, like smoke from a campfire. The blue radio light snakes around the outside of the spiral galaxy, through the elliptical galaxy and into the plume, forming a teardrop shape. The pink infrared light highlights the centers of the spiral and elliptical galaxies.

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Arp Bot 🤖 @arpbot.bsky.social · 14/09/2026

Sloan Digital Sky Survey image of Arp 1, also known as NGC 2857. NGC 2857 is a spiral galaxy in the constellation Ursa Major. Credit: SDSS Source

A two-armed spiral galaxy with a small, bright, circular core. The muted, yellowish-green spiral arms wind tightly counterclockwise around the yellow core.

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Arp Bot 🤖 @arpbot.bsky.social · 14/09/2026

Image of Arp 78, also known as NGC 772 and NGC 770, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Spiral galaxies - Small, high surface brightness companions. Source

A grainy, black and white image of a nearly face-on spiral galaxy. Appearing somewhat like an aerial view of a hurricane, the galaxy's spiral arms swirl around a bright center. The curling arms are defined by dark dust lanes. While the arms in the right half of the galaxy are somewhat poorly defined, in the left of the galaxy, one overdeveloped spiral arm curves clockwise from about 6 o'clock to about 11 o'clock. Since this arm flattens out near its end, in contrast to the rounder right half, the overall shape of the galaxy resembles a paisley. To its right, near the center, is its small companion galaxy, seen as a fuzzy oval. The black background of space is filled with many white dots which are stars.

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Arp Bot 🤖 @arpbot.bsky.social · 13/09/2026

Hubble image of Arp 189, also known as NGC 4651 or the Umbrella Galaxy. While not visible in this image, NGC 4651 was included in the Arp catalog because of a narrow stellar stream in its outskirts, the remnants of a small galaxy. Credit: ESA, NASA, D. Leonard Source

$The central portion of a large, nearly face-on spiral galaxy fills the frame. In the center is a small, bright, yellow-white nucleus. At its edge several dust lanes, made of a lacy web of brown filaments, spiral clockwise. Between the filaments are young stars and star clusters, seen as bright blue dots. A few foreground stars with Hubble's 4-pointed diffraction spikes are scattered across the galaxy. The brightest one is in the lower left.$

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Arp Bot 🤖 @arpbot.bsky.social · 13/09/2026

JWST MIRI image of Arp 142, also known as NGC 2936 and NGC 2937, or the Penguin and the Egg. The Egg appears as a small teal oval made of the oldest stars in the elliptical galaxy. The Penguin's distorted spiral is made of cool gas and dust. Credit: NASA, ESA, CSA, STScI Source

$Two interacting galaxies known as Arp 142 in a horizontal image taken in mid-infrared light. At left is NGC 2937, an elliptical galaxy that looks like a tiny teal oval and is nicknamed the Egg. At right is NGC 2936, a distorted spiral galaxy nicknamed the Penguin, which is significantly larger. A beak-like region points toward the Egg, but lies far above it. Where the eye would be is an opaque, almost washed-out pink spiral. This galaxy’s distorted pink, purple, and blue arms create the bird’s beak, back, and tail. The tail, which is closer to the Egg, is wide and layered, like a beta fish’s tail. The Penguin and the Egg appear very separate. The galaxy at top right, PGC 1237172, is barely visible. A brighter slightly larger blue foreground star that is over top of this galaxy has tiny diffraction spikes. Throughout the image are tiny galaxies in bright reds, greens, and blues. The background of space is black.$

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Arp Bot 🤖 @arpbot.bsky.social · 12/09/2026

Gemini South image of Arp 271, also known as NGC 5426 and NGC 5427. This pair of galaxies are tugging on each other with gravity. We can see this interaction in the bridge of stars connecting the galaxies. Credit: International Gemini Observatory, NOIRLab, NSF, AURA Source

Two similar-looking spiral galaxies take up most of the frame. They both have bright, yellow-white central cores and well-defined spiral arms dotted with pink star forming regions. NGC 5427 is a nearly face-on spiral galaxy at lower left. NGC 5426 is a more oblique galaxy at upper right. The two spiral arms on the upper side of NGC 5426 appear as a bridge that connects with NGC 5427. The black background of space is dotted with stars and small background galaxies.

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Arp Bot 🤖 @arpbot.bsky.social · 12/09/2026

Image of Arp 291, also known as UGC 5832, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Double and multiple galaxies - Wind effects. UGC 5832 is a one-armed barred spiral galaxy. Source

A grainy, black and white image of a one-armed barred spiral galaxy. The bar, seen as a bright white vertical line anchors the galaxy. Beginning at about the 6 o'clock position, a spiral arm wraps clockwise around the galaxy, ending at around 12 o'clock. The arm is formed from a haze of stars and are dotted with bright blue-green star clusters. The black background of space is filled with small galaxies and foreground stars, which are seen as white dots.

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Arp Bot 🤖 @arpbot.bsky.social · 11/09/2026

Hubble image of Arp 300, also known as UGC 05028 and UGC 05029 . UGC 05028 (smaller spiral) and UGC 05029 (larger spiral) form an interacting galaxy pair. The bright knot in UGC 05028 may be another small galaxy. Credit: NASA, ESA, J. Dalcanton, R. Windhorst, Gladys Kober Source

The frame is dominated by a pair of spiral galaxies. The larger galaxy to the bottom right is seen nearly face-on. It has a small yellow core and many spiral arms that are dotted with blue star clusters, with more star clusters appearing on the top of the galaxy, the side that faces its companion. There are a few brown dust lanes, concentrated near the inner spiral arms. The smaller spiral galaxy to the upper right has a yellow bar structure that is surrounded by blue star clusters that only very roughly form spiral arms. On the right side of the galaxy is a yellow knot of stars that is brightest in its center, crossed by brown dust lanes. This may be a seperate dwarf galaxy that is either in front of the smaller spiral or is in the process of merging with it. Other distant galaxies and stars fill the black background of space.

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Arp Bot 🤖 @arpbot.bsky.social · 11/09/2026

Composite image of Arp 26, also known as M101 or the Pinwheel Galaxy. It combines data from X-ray (Chandra, purple), infrared (Spitzer, red), visible light (Hubble, yellow), and ultraviolet (GALEX, blue) telescopes. Credit: NASA, CXC, SAO;NASA, JPL-Caltech;NASA, STScI Source

A multiwavelength image of a spiral galaxy. The galaxy has a small pink core. Several arms spiral clockwise around the core. They are crossed by pink, filamentary dust lanes and made of a haze of yellow stars. Along the arms are purple splotches. In the outer parts of the galaxy, the arms appear blue, dotted with blue star clusters. The arms are somewhat well-defined but asymmetric. One arm curls from about 6 o'clock to 9 o'clock and is mostly separated from the body of the galaxy. Other arms cover the area from 12 o'clock to 6 o'clock.

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Arp Bot 🤖 @arpbot.bsky.social · 10/09/2026

Image of Arp 148, also known as Mayall's Object, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Amorphous galaxies - Associated rings. The two galaxies colliding likely created the ring. Source

A grainy, black-and-white image of a pair of galaxies. In the center is a small, wide, bright white vertical line, likely an edge-on galaxy. Above this is a ring galaxy, seen as a blotchy circle. The two galaxies overlap so that the top edge of the edge-on galaxy intersects with the ring galaxy's center. A few white dots, which are stars, fill the black background of space.

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Arp Bot 🤖 @arpbot.bsky.social · 10/09/2026

Hubble image of Arp 78, also known as NGC 772. The cropped view does not show the galaxy's overdeveloped spiral arm, caused by interactions with a companion, which led to its inclusion in Arp's catalog of peculiar galaxies. Credit: ESA, NASA, A. Seth et al. Source

The central portion of a large, nearly face-on spiral galaxy fills the frame. In the center is a small, bright, yellow-white nucleus. It is surrounded by a mostly featureless yellow oval, made of a haze of older yellow stars. At the edge of the oval, several dust lanes, made of a lacy web of brown filaments, spiral counter-clockwise. Scattered between the filaments, especially in the lower right corner of the frame, are young star clusters, seen as bright blue dots.

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Arp Bot 🤖 @arpbot.bsky.social · 09/09/2026

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 with clumps of star formation appears to connect it to NGC 2798, at right. Credit: ESA, NASA, J. Dalcanton, J. Schmidt Source

A pair of interacting galaxies. The galaxy on the left is seen edge-on. It has a bright central core and a slightly warped disk that is dotted with star clusters and clumps of dark dust. The edge of the disk arcs to the right, appearing to connect to its companion galaxy. The second galaxy is inclined, but seen closer to face-on. It has a central bar of bright stars that is largely obscured by a haze of stars and dust lanes in the circular core of the galaxy. Two spiral arms emerge from the core, which are wide and poorly defined.

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Arp Bot 🤖 @arpbot.bsky.social · 09/09/2026

Image of Arp 287, also known as NGC 2735 and NGC 2735A, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Double and multiple galaxies - Wind effects. Source

A grainy, black and white image of of a pair of interacting galaxies. The large spiral at center is tilted at an angle, so it appears as an oval-shape rather than a circle. The long axis of the oval is nearly vertical. Below is a smaller, irregular galaxy. A bridge of gas and stars connects the two galaxies. A similar tail emerges from the above the central spiral galaxy. A few white dots, which are stars, are seen on the black background.

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Arp Bot 🤖 @arpbot.bsky.social · 08/09/2026

Image of Arp 283, also known as NGC 2798 and NGC 2799, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Double and multiple galaxies - Infall and attraction. A bridge connect the pair. Source

A grainy, black and white image of a pair of interacting galaxies. The galaxy on the right is seen edge-on. It has a bright central core and a slightly warped disk that is dotted with star clusters and clumps of dark dust. The edge of the disk arcs to the right, appearing to connect to its companion galaxy. The second galaxy is inclined, but seen closer to face-on. Two spiral arms emerge from the core, which are wide and poorly defined.

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Arp Bot 🤖 @arpbot.bsky.social · 07/09/2026

Gemini North image of Arp 336, also known as NGC 2685 or the Helix Galaxy. Its perpendicular ring of gas, stars, and dust was likely captured from an interaction with another galaxy. Credit: International Gemini Observatory, NOIRLab, NSF, AURA, L. Bassino Source

A lenticular galaxy has an pale yellow central core that forms a fuzzy bar structure. Surrounding this is an almond-shaped area with bluer stars and star clusters. Together, they somewhat resemble an eye. Several brown, slightly curved dust lanes cross the galaxy vertically on its left half. The black background of space is dotted with stars and smaller galaxies.

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Arp Bot 🤖 @arpbot.bsky.social · 06/09/2026

Hubble and Spitzer image of Arp 148, also known as Mayall's Object. The white inset shows a section of the galaxy from specially-processed Spitzer data. It reveals the infrared light from a dust-obscured supernova. Credit: NASA, JPL-Caltech, STScI Source

A pair of interacting galaxies with inset showing a supernova. The galaxy on the left is likely an edge-on disk galaxy, appearing as a slightly warped, fuzzy, white horizontal line with dust filaments at its center. It is surrounded by a red glow on the left part of the galaxy and a green glow at its right edge. The galaxy on the right is a ring galaxy, appearing as a blue circular ring, dotted with blue star clusters, that also has its center partially filled in with blue star clusters. At about the 11 o'clock position is a circle outlined in white. It shows a pixelated red dot — a supernova. The two galaxies overlap so that the right end of the edge-on galaxy intersects with the ring galaxy's center. It looks a bit like a big blue hand holding the Enterprise in a classic episode of Star Trek.

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Arp Bot 🤖 @arpbot.bsky.social · 06/09/2026

Hubble image of Arp 182, also known as NGC 7674 and NGC 7674A. NGC 7674 is the largest of the four galaxies in the Hickson 96 compact group. Tidal interactions with its companions created the long, narrow streamers to the left and below the galaxy. Credit: NASA, ESA, STScI Source

A large, face-on spiral galaxy sits at the center of the frame. Below it is a much smaller spiral galaxy companion. The larger galaxy has a bright yellow center that transitions into a short bar structure. At the ends of the bar are two well-defined spiral arms that wind clockwise around the galaxy. They are crossed by brown dust lanes and dotted with blue star clusters. At the bottom of the galaxy, one of the spiral arms continues on in a long, faint tail that points up and to the left. Directly below the large spiral is its smaller companion. It has a hazy yellow disk, with a swirl of brown dust lanes that mark out spiral arms. A very faint tail of stars runs in an almost vertical line from the bottom of the galaxy, extending all the way to the bottom of the frame. A second small galaxy, seen as an irregular, clumpy, blue-white oval shape is to the right of the small spiral. The black background of space is dotted with tiny galaxies and small foreground stars.

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Arp Bot 🤖 @arpbot.bsky.social · 05/09/2026

Hubble image of Arp 185, also known as NGC 6217. This was the first image of a celestial object taken with the newly repaired Advanced Camera for Surveys (ACS) after the 2009 Servicing Mission 4 for the Hubble Space Telescope. Credit: NASA, ESA, and the Hubble SM4 ERO Team Source

A face-on barred spiral galaxy fills most of the frame. The galaxy has a bright yellow-white center, surrounded by a yellow bulge. This transitions into a prominent diagonal bar structure, which points from bottom left to top right. At the ends and sides of the bar are a series of short, somewhat ill-defined spiral arms, dotted with blue star clusters, pink star-forming regions, and brown dust lanes. At the edges of the galaxy the spiral arms appear to continue, curving counter-clockwise at the top and bottom, defined by widely spaced, faint star clusters. The galaxy sits on the black background of space, with a few scattered foreground stars and tiny background galaxies.

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Arp Bot 🤖 @arpbot.bsky.social · 05/09/2026

Pan-STARRS image of Arp 7. It is a barred spiral galaxy in the constellation Hydra. Credit: Pan-STARRS1 Surveys (PS1) Source

A two-armed spiral galaxy with a small, bright, circular core and a small bar. The upper spiral arm forks into two as it curves around the top of the galaxy. A foreground star, seen as a bright white dot, sits in front of the galaxy, near it's core. A few stars dot the black background.

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Arp Bot 🤖 @arpbot.bsky.social · 04/09/2026

Hubble Space Telescope image of Arp 5, also known as NGC 3664. NGC 3664 is a barred Magellanic spiral galaxy with a single spiral arm and prominent bar. It is interacting with a dwarf galaxy, out of frame. Credit: NASA, ESA, STScI, Solomon Hendrix Source

A galaxy with a loose bar and one spiral arm. The spiral arm begins at the left side of the orange-ish bar, wraps around the bar clockwise, almost completing a circle. Dotted along the spiral arms are splotchy, bright blue star clusters. The image has a staircase-like shape, with a black area in the upper left corner, characteristic of images made with Hubble's Wide Field and Planetary Camera 2.

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