Not only is Andromeda XXXV the dimmest and smallest known satellite galaxy in the Andromeda system, it’s about 3 million light-years away, making it very hard to spot. The ellipse within the inset shows where this companion galaxy was discovered. Image credit: CFHT/MegaCam/PAndAS (Principal investigator: Alan W. McConnachie; Image Processing: Marcos Arias)

This new knowledge comes from the outskirts of Andromeda, the Milky Way’s nearest major galactic neighbor, where astronomers have found the system’s smallest and dimmest satellite galaxy to date.

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