Cosmology2026-05-291 minarXiv:2605.31335expressDark Matter Takes a HitDark matter is the invisible scaffold of the universe. It doesn't shine, but its gravity holds stars in galaxies. In some models, dark matter particles can collide and exchange energy, like molecules in warm air.Demao Kong·Hai-Bo Yugravitational lensingJeans instabilityAdam RiessAlan GuthAlbert Einsteindark matterdark energygalaxy clusteractive galactic nucleusactive galactic nucleus👍👎☆SimplePopularAdvanced