Dark matter may consist of two particle types that gradually separate

A new study proposes that dark matter may consist of at least two distinct particle types that slowly separate over time, with heavier particles sinking to galactic centres and lighter ones drifting outward. This idea could simultaneously explain several puzzling cosmic observations, including unusually diffuse dwarf galaxies and unexpectedly dense dark matter clumps observed through gravitational lensing. The theory represents a significant departure from previous single-particle models of dark matter.

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