Dark matter makes up 85% of the matter in the Universe, yet its true nature remains elusive. One key to unlocking dark matter’s mystery may lie with protogalaxies, cosmic cradles that nurtured the first stars. Dark matter would have influenced the distribution and shapes of these galactic precursors in ways that could indicate what types of particles comprise this enigmatic substance. Now, new simulations offer a glimpse at what the earliest star-forming regions may have looked like under competing dark matter theories.

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