Gravitational lensing
Gravitational lensing refers to the deflection of light caused by the gravitational influence of mass along its path. It is a consequence of spacetime curvature described by general relativity.
Gravitational lensing is discussed in astrophysics, cosmology, and observational astronomy.
Status
Gravitational lensing is observed in multiple regimes, including strong, weak, and microlensing. It is used to study mass distributions, dark matter, and distant astronomical objects.