Why Gravitational Lensing Enables Detection of Dark Matter Halos

引力透镜效应为何能探测暗物质晕

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General relativity predicts massive objects warp spacetime geometry, deflecting light paths from distant galaxies—creating distorted, magnified, or multiply imaged backgrounds.
Weak lensing measures statistical shape distortions across thousands of galaxies to map projected mass distributions—including non-luminous components.

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