There is no official astronomical ranking of the strangest galaxies. The strongest examples here stand out for unusual structure or for an appearance created by gravity: Hoag’s Object has a blue ring around a red stellar core, AM 0644-741’s ring records a galactic collision, and NGC 6505 appears to wear a ring made from bent light. These are three well-supported cases, not a defensible top ten.
What makes a galaxy strange?
“Strangest” is a description, not a formal galaxy class. A galaxy may look unusual because of its actual shape, the motion of its stars, or a past interaction with another galaxy. In a different kind of spectacle, gravity can bend light from a distant background galaxy into a ring around a foreground galaxy. That ring is an optical effect of gravitational lensing, not a structure made of stars in the foreground galaxy.
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NASA’s overview of Hubble observations describes galaxies that spin backwards, interacting galaxies on their way toward merging, and ring-shaped galaxies that may result from gravitational encounters. NASA also notes that irregular galaxies can take forms as unusual as toothpicks or rings, and that interactions can distort or reshape galaxies. Those broad categories help explain why galaxies can look strange, but they do not establish a ranked list of individual objects. NASA’s Hubble overview of galaxies and its guide to galaxy types provide that context.
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Three galaxies with striking, well-documented features
1. Hoag’s Object: a blue ring around a red core
Hoag’s Object looks like a bright blue outer ring surrounding a ball of much redder stars, with an almost completely dark gap between them. NASA describes the red stars as likely older than the stars in the blue ring. The object spans about 100,000 light-years and lies about 600 million light-years away toward the constellation Serpens, according to NASA’s approximate figures.
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Its appearance is clear; its origin is not. NASA says the formation of Hoag’s Object remains unknown. Suggested explanations include a galaxy collision billions of years ago or the gravitational influence of a central bar that later disappeared. Neither explanation should be treated as settled. NASA’s Hubble account of Hoag’s Object even frames the puzzle with the question, “Is this one galaxy or two?”
2. AM 0644-741: a ring shaped by a collision
AM 0644-741’s blue ring has a different explanation. NASA’s Astronomy Picture of the Day describes a smaller intruder galaxy passing through a larger one. The encounter compressed gas and dust, setting off star formation that spread outward in a wave and formed the ring. NASA gives the ring’s diameter as about 150,000 light-years and places the system about 300 million light-years away toward the constellation Volans.
The contrast with Hoag’s Object matters: NASA presents a collision-driven process for AM 0644-741, while Hoag’s Object’s formation remains uncertain. NASA’s APOD explanation of AM 0644-741 describes the collision and the resulting ring.
3. NGC 6505: a ring made of lensed light
NGC 6505 is an elliptical foreground galaxy whose gravity bends light from a more distant galaxy behind it. In images from ESA’s Euclid telescope, that bent light forms an Einstein ring aligned around the foreground galaxy. NASA reports that NGC 6505 is about 590 million light-years away, while the background source is about 4.42 billion light-years away. The background galaxy had not previously been observed and did not yet have a name in NASA’s report.
The ring is not a band of stars orbiting NGC 6505. It is the distorted appearance of the background galaxy’s light, produced by gravitational lensing. Euclid Archive Scientist Bruno Altieri said he noticed a hint of the ring in early test images; after further observations, “we could see a perfect Einstein ring.” NASA’s report on the Euclid Einstein ring describes the observation and the two galaxies’ distances. NASA also covered the discovery in a separate Euclid report.
Why this is not a true top ten
A ranked list of ten named galaxies would imply that comparable evidence exists for all ten and that their “strangeness” can be scored consistently. The available examples do not support that claim. NASA’s overview mentions unusual motion, interactions, and ring-shaped galaxies, but does not give enough individual case histories to build a reliable ten-object ranking.
The three examples above instead show distinct reasons galaxies can seem strange: a ring-and-core structure with an unresolved origin, a ring linked to a collision, and a ring that is not physical structure in the foreground galaxy at all. Their sizes and distances belong to their own descriptions; they are not a common scale for measuring strangeness.
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What galaxy images can—and cannot—tell you
A striking image can reveal a real structure or event, but it does not necessarily establish how that structure formed. Hoag’s Object is the clearest example: the ring and core are observed, while its origin remains unknown. Likewise, an Einstein ring can make one galaxy seem to have a dramatic circular feature when the visible ring is actually lensed light from a background source.
Hubble’s Ultra Deep Field contains over 10,000 galaxies in a small patch of sky, according to NASA’s overview. That abundance underscores the variety astronomers can observe, but the number does not create an objective ranking of unusualness. “Strange” remains a useful way to describe a particular feature—not a scientific score.
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