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NGC 3137 is not established as a Milky Way twin. Its value to astronomers is that it belongs to the NGC 3175 group, a collection of galaxies NASA says is broadly comparable in structure to our Local Group. Studying how the galaxies and their smaller companions fit together can offer clues about the dynamics of our own galactic neighborhood.
What does NGC 3137 tell us about the Milky Way?
NGC 3137 is a spiral galaxy in the constellation Antlia, about 53 million light-years from Earth, according to NASA’s May 1, 2026 Hubble release. It is a member of the NGC 3175 group. NASA describes that group as similar in broad terms to the Local Group, which contains the Milky Way, Andromeda and smaller companion galaxies. The useful comparison is between the groups—not a claim that NGC 3137 itself matches the Milky Way in mass, history, or star formation.
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Galaxies do not evolve in isolation. The members of a group interact through gravity, and the arrangement of large galaxies and smaller companions can help astronomers investigate how such systems develop. NASA summarizes the value of this comparison: “By studying this nearby galaxy group, astronomers can learn about the dynamics of our own galactic home.” NASA’s Hubble release does not provide a detailed numerical comparison between NGC 3137 and the Milky Way.
How is the NGC 3175 group like the Local Group?
Both groups have two prominent spiral galaxies alongside smaller dwarf companions. That shared broad arrangement makes the NGC 3175 group a useful setting for studying group structure and dynamics from the outside. It does not mean the groups have identical members or histories.
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The dwarf-galaxy count in the NGC 3175 group is uncertain. NASA reports more than 500 dwarf-galaxy candidates, but says the actual number of tiny companions is not yet known. Candidates should not be treated as a confirmed census, and the release does not provide a directly comparable count for the Local Group.
What does Hubble’s image show?
NGC 3137 is highly inclined as seen from Earth, offering a distinctive view of its loose spiral structure. The Hubble image combines observations in six color bands. Bright blue clusters indicate hot, young stars; red glowing gas clouds mark regions where young stars remain associated with their birth nebulae. Dusty clouds also surround the galaxy’s center.
Not every object visible in the image belongs to NGC 3137: foreground stars in the Milky Way and more distant background galaxies appear in the same field. The European Space Agency’s image release also presents the galaxy as part of this wider view of a familiar kind of galactic neighborhood.
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The observations are part of Hubble program #17502, led by principal investigator D. Thilker. NASA says the program examines star clusters in 55 nearby galaxies. Identifying clusters alongside their surrounding nebulae can help astronomers determine stellar ages and study populations at different stages, from young stars to older ones. The aim is to examine stellar life in spiral galaxies, rather than to establish a single star-formation-rate figure for NGC 3137.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What is known about NGC 3137’s central black hole?
NASA’s release gives an estimated mass of 60 million solar masses for the galaxy’s central black hole. It presents this as an estimate and does not explain the measurement method, so the figure should not be read as a direct weighing or as a basis for comparing the black hole with the Milky Way’s.
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