Gravitational Lensing

The bending of light by gravity, first observed during the 1919 solar eclipse by Arthur Eddington, transforms how we map the invisible. This phenomenon, proven at 1.75 arcseconds deflection near the sun, allows astronomers to detect dark matter concentrations and galaxies 10 times fainter than Hubble's usual limits. Its precise predictions have enabled over 100 confirmed Einstein rings, making it a cornerstone of modern cosmology.