This illustration shows the comparative sizes of our Milky Way Galaxy and an ultracompact galaxy, which existed in the early universe. Although the compact galaxy is only a fraction of the size of our Milky Way, it contains the same number of stars. The small, dense galaxy could fit inside the central hub of our Milky Way.
Image Type: Illustration
Credit: NASA, ESA, A. Feild (STScI), and P. van Dokkum (Yale University)
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