Hubble Frontier Fields view of Abell 2744. Credit: NASA, ESA, and J. Lotz, M. Mountain, A. Koekemoer, and the HFF Team (STScI).
Astronomers have found 76 new ultra-diffuse galaxies (UDGs) in the massive galaxy cluster designated Abell 2744 (also known as Pandora’s Cluster). The discovery updates the current census of galaxies in this cluster and could help better understand the nature of UDGs in general. UDGs are extremely-low-density galaxies. The largest UDGs have sizes similar the Milky Way but have only about 1% as many stars as our home galaxy. The mystery of UDGs is still baffling scientists as they try explain why these faint but large galaxies are not ripped apart by the tidal field of their host clusters...
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