AST-469intermediate

Gravitational Lensing, Redshift & Time Dilation: Observation, Measurement & Evidence

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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intermediate50 minFact checked

Gravitational Lensing, Redshift & Time Dilation: Observation, Measurement & Evidence

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AST-468Gravitational Lensing, Redshift & Time Dilation: Physical Mechanisms→

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AST-470Gravitational Lensing, Redshift & Time Dilation: Advanced Connections→

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

supported

Photons follow null geodesics through curved spacetime.

supported

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.