Gravitational lensing
Concept
The bending of light by massive objects, predicted by general relativity and confirmed by observing stars near the sun during an eclipse.
Mentioned in 3 videos
Videos Mentioning Gravitational lensing

Avi Loeb: Aliens, Black Holes, and the Mystery of the Oumuamua | Lex Fridman Podcast #154
Lex Fridman
A phenomenon predicted by Einstein where gravity deflects light, explaining giant arcs of light observed around galaxy clusters.

Doctor Asks Physics Questions (ft @MedlifeCrisis)
Sabine Hossenfelder
The distortion of background light from galaxies and galaxy clusters, used to map dark matter distribution.

Dark matter: the next frontier – Public lecture by Dr. David E. Kaplan
Fermilab
The bending of light by massive objects, predicted by general relativity and confirmed by observing stars near the sun during an eclipse.