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Two undergraduates at San José State University have discovered two galaxies that are the densest known. Similar to ordinary globular star clusters but a hundred to a thousand times brighter, the new systems have properties intermediate in size and luminosity between that of galaxies and star clusters.
Shown here is an artist’s depiction of the night sky as seen from a planet at the heart of an ultracompact galaxy.Image credit: NASA, ESA, G. Bacon (STScI) and P. van Dokkum (Yale University)
