AST-466beginner

Gravitational Lensing, Redshift & Time Dilation: Foundations

Curved spacetime changes the paths of light and the rates of clocks. These effects map dark matter, measure galaxy-cluster mass, discover exoplanets through microlensing, test relativity, correct navigation systems, and probe compact objects.

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Gravitational Lensing, Redshift & Time Dilation: Foundations

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AST-465General Relativity & Curved Spacetime: Advanced Connections→

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AST-467Gravitational Lensing, Redshift & Time Dilation: Structures & Vocabulary→

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Curved spacetime changes the paths of light and the rates of clocks.

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Photons follow null geodesics through curved spacetime.

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Solar-eclipse and radio observations confirm light deflection, galaxy clusters produce dramatic gravitational arcs, atomic clocks show gravitational time shifts over small height differences, and compact-star spectra can exhibit gravitational redshift.