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

Researchers discovered about 50 faint dwarf galaxies around three large systems, challenging current estimates of dwarf galaxy numbers in the universe. Dwarf galaxies with masses up to a billion suns are the most common, but their low luminosity makes them hard to detect.

• Nearly 50 'ghost galaxies' found around three systems
• Dwarf galaxies have masses up to a billion suns
• Low luminosity hinders their detection
• Results challenge dwarf galaxy counts