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The difference is subtle, but important. Regular matter can be dark because it absorbs light. It's why, for example, we can see theLight is an electromagnetic wave, and atoms contain electrically charged electrons and protons, so matter can emit, absorb and scatter light. Dark matter isn't electrically charged. It has no way to connect with light, and so when light and dark matter meet up they simply pass through each other.
Since we haven't directly observed dark matter particles we can only speculate, but most dark matter models argue that gravity is the only common link with light and regular matter. Dark and regular matter clump around each other, but they don't collide and merge like interstellar clouds.The study looks at six ultrafaint dwarf galaxies, or UFDs. They are satellite galaxies near the Milky Way that seem to have far fewer stars than their mass would suggest.
To test this the team ran computer simulations of both scenarios. They found that in the non-interacting model the distribution of stars should become more dense in the center of the UFDs and more diffuse at the edges.
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