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From New Atlas:
Some of the strongest evidence for dark matter to date has been discovered – and ironically, that's thanks to its absence. In a pair of studies published this week, astronomers have shed new light on dark matter through close observation of a galaxy previously found to have very little of the stuff, while the same team found a new example of a similar oddball galaxy.
It's generally believed that galaxies are held together through the gravitational influence of clumps of dark matter, so to find a galaxy with little to no dark matter was a surprise. And while it might sound like a strike against the theory, it actually ends up supporting it.
A Second Galaxy Missing Dark Matter in the NGC 1052 Group (DOI: 10.3847/2041-8213/ab0d92) (DX)
Still Missing Dark Matter: KCWI High-resolution Stellar Kinematics of NGC1052-DF2 (DOI: 10.3847/2041-8213/ab0e8c) (DX)
(Score: 0) by Anonymous Coward on Tuesday April 02 2019, @05:49PM (1 child)
"Gravity," per se, does not exist. It's an artifact of the distortion of spacetime by mass.
How does that old saw go again? Spacetime tells matter how to move; matter tells spacetime how to curve.
(Score: 1) by khallow on Wednesday April 03 2019, @02:18AM
An observable artifact. That makes it just as real as anything else you can observe.