1 of 1
Story summary
- Michael Keim of Yale University announced that dwarf galaxy NGC 1052-DF9, 67 million light-years away, shows motion without dark matter.
- DF9 becomes the third known galaxy, after DF2 and DF4, whose dynamics lack dark matter.
- Researchers propose a bullet dwarf collision in which gas stalls while stars and dark matter pass through.
- Simulations indicate such collisions can create ordinary-matter-rich, dark-matter-poor regions that may form tiny dark-matter-free galaxies.
