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Are two galaxies which seem to lack dark matter proof that dark matter must be a particle rather than a quirk of gravity at cosmic scales. Well, it's actually kind of complicated...
Cosmologists have been trying to figure out what dark matter is made of for decades and getting nowhere. And now, some are wondering if dark matter is just an illusion created by gravity.
Theoretical physicists seem ready to move on from looking at dark matter as unknown particles we’ve yet to discover, and consider it a side-effect of gravity at cosmic scales.
It turns out that one of the best ways to learn about dark matter is to turn out the lights, lean back, and closely watch a little gravitational galaxy on galaxy action.
Two astronomers think they found evidence in the Cosmic Microwave Background Radiation that the amount of dark matter in the universe is far smaller than currently thought.
The survey which figured out the right way to view the remaining visible universe has been misconstrued to mean we no longer need to investigate dark matter.
Add another bizarre, universe-defining darkness to your list.