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Nearly 50 'ghost galaxies' emerge around three hosts, challenging dwarf galaxy counts

Nearly 50 'ghost galaxies' emerge around three hosts, challenging dwarf galaxy counts Sadie Harley Scientific Editor Robert Egan Senior Editor Dwarf galaxies—with a mass equal to about a billion suns, but often considerably less—are the most abundant in the universe. However, because of their low luminosity, they are very difficult to detect.

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