Astronomy & Space Science · AST-561
Dark Matter Halos & Gravitational Lensing: Foundations
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Overview
Core model: Dark Matter Halos & Gravitational Lensing
Dark-matter halos dominate the mass budgets of many galaxies and galaxy clusters. Because dark matter emits little or no light, gravitational lensing provides one of the most direct ways to map its projected mass distribution without assuming that mass follows starlight.
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References & evidence
Source library for this chapter
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- 01Galaxies — SummaryOpen source ↗
OpenStax Astronomy 2e
- 02The Evolution and Distribution of Galaxies — SummaryOpen source ↗
OpenStax Astronomy 2e
View claim-by-claim traceability3 verified claims
Dark-matter halos dominate the mass budgets of many galaxies and galaxy clusters.
supported · checked Sep 22, 2026Galaxy rotation, cluster dynamics, strong-lensing arcs, weak-lensing shear, and collision systems all require more mass than observed baryons provide.
supported · checked Sep 22, 2026Mass curves spacetime and alters light paths.
supported · checked Sep 22, 2026