Weighing the Invisible

Synthesis: One Pattern, Many Scales

The dark-matter argument is strong because it is not balanced on one observation. Galaxy rotation curves infer extended mass from orbital speeds. Cluster collisions compare X-ray gas to gravitational lensing maps. The cosmic web tests whether gravity can grow the observed pattern of filaments, clusters, and voids over cosmic time.

Those are different observables and different models, but they point toward the same broad conclusion: visible matter is not the whole gravitating matter budget.