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Study Finds Galaxy Without Dark Matter, Challenges Gravity Theories

4/3/2026

Summary

Story summary

The ultra-diffuse galaxy NGC 1052-DF9 appears to lack dark matter, supporting the Bullet Dwarf collision theory.
The Bullet Dwarf theory holds that collisions between gas-rich dwarf galaxies can separate normal matter from dark matter.
The findings challenge MOND, which posits gravity changes at low accelerations.
Past discoveries, including NGC 1052-DF2 and NGC 1052-DF4, show galaxies can exist without dark matter, and researchers will study more galaxies in this string.

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Story summary

The ultra-diffuse galaxy NGC 1052-DF9 appears to lack dark matter, supporting the Bullet Dwarf collision theory.
The Bullet Dwarf theory holds that collisions between gas-rich dwarf galaxies can separate normal matter from dark matter.
The findings challenge MOND, which posits gravity changes at low accelerations.
Past discoveries, including NGC 1052-DF2 and NGC 1052-DF4, show galaxies can exist without dark matter, and researchers will study more galaxies in this string.