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Observations of a distant galaxy cluster collision reveal a core of invisible matter devoid of glittering galaxies-something that is hard to explain by current theories.
The first option is that the galaxies were catapulted out of the dark matter halo by some kind of gravitational "slingshot" effect. The problem, however, is that computer simulations have failed to produce slingshots powerful enough to cause such a separation.
An alternative idea is that there is more than one form of dark matter and that the different types interact with each other. But conceding such a possibility would mean conjuring up yet another unknown substance that is as mysterious as dark matter itself.