New Haven3 galaxies, 65 million light-years away, lack dark matter.
Yale astrophysicist Michael Keim says they show dark matter is more than modified gravity.
A June paper proposes two galaxies collided, clumping their gas while dark matter passed through and left DF2, DF4 and DF9 bare.
“The absence of dark matter is, in a way, some evidence of dark matter, which is ironic,” said Shyam Balaji, a King’s College London theorist.
Candidates still range from stealthy neutrinos to WIMPs to atom-sized primordial black holes.
How each outlet framed it
- Quanta Magazine
- frames the three ghost galaxies as a threat to alternative gravity theories, not only a dark matter puzzle
Sources: Quanta Magazine