Astronomers using the Gemini North telescope, one-half of the International Gemini Observatory operated by NSF's NOIRLab, have captured the eroding remains of more than 100 dwarf galaxies as they transition into ultra-compact dwarf galaxies, objects with masses much greater than star clusters yet much smaller than dwarf galaxies. These findings confirm that many ultra-compact dwarf galaxies are likely the fossil remains of normal dwarf galaxies that have been stripped of their outer layers.
Dwarf galaxies stripped of stars prove to be the missing link in the formation of rare ultra-compact dwarf galaxies
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https://phys.org/news/2023-11-dwarf-galaxies-stars-link-formation.html