Astronomers Discover Terzan 5’s True Nature

A combined HST/JWST study of Terzan 5 reveals that it has different populations of stars and may not be a globular cluster. Instead, it could be a so-called "bulge fossil fragment." Credit: NASA, ESA, CSA, STScI, G. Zullo (University of Bologna), F. R. Ferraro (University of Bologna). Image Processing: A. Pagan (STScI)

Observations of a distant cluster of stars in our galaxy have resulted in a new class of objects that turn out to be galactic building blocks. Researchers used Hubble Space Telescope (HST) and the James Webb Space Telescope (JWST) to study the stars that make up Terzan 5, long though to be a globular cluster. What they found puts that cluster into a very rare class of objects called “bulge fossil fragments.”

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