Dark matter does not emit or absorb light, making it invisible. However, its gravitational pull influences the movement of stars and galaxies. Without dark matter, galaxies would not have formed as we see them. It’s thought to comprise about 27% of the universe’s energy density. Observations of cosmic structures suggest dark matter clumped early, guiding galaxy formation. Understanding its origin helps explain cosmic evolution.
Dark matter matters because it dominates the mass budget of the universe.
It also affects galaxy formation, rotation curves, and large-scale structure.
Most matter in the universe is invisible, formed shortly after the Big Bang.
European Southern Observatory [eso.org]