New, high-resolution observations of a faint, fluffy galaxy suggest that dark matter’s not as ubiquitous as scientists thought.
that also seemed to lack dark matter. “These galaxies that we found in 2018, they created a lot of controversy and discussion and follow-up work because they were unexpected and difficult to explain,” van Dokkum says.
Starting in the 1960s, American astronomer Vera Rubin and others first revealed the likely existence of unseen, or “dark,” matter while measuring how fast stars in galaxies whirl around the center, showing that inner stars orbit at different speeds than outer ones. Based on those stars’ rotation, scientists calculated how much mass the galaxy must have to keep them constantly orbiting, rather than being flung into space.
But assuming the team is right, it’s not yet clear exactly what kind of exception their galaxy may be. Is it a really weird cosmic object that nobody understands? Or is it a harbinger of bigger problems for dark matter theories?
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