GENERAL KNOWLEDGE

Detailed explanation-1: -Gravitational lensing occurs when a massive celestial body-such as a galaxy cluster-causes a sufficient curvature of spacetime for the path of light around it to be visibly bent, as if by a lens. The body causing the light to curve is accordingly called a gravitational lens.

Detailed explanation-2: -A gravitational lens can occur when a huge amount of matter, like a cluster of galaxies, creates a gravitational field that distorts and magnifies the light from distant galaxies that are behind it but in the same line of sight. The effect is like looking through a giant magnifying glass.

Detailed explanation-3: -As the light emitted by distant galaxies passes by massive objects in the universe, the gravitational pull from these objects can distort or bend the light. This is called gravitational lensing.

Detailed explanation-4: -Although astronomers cannot see dark matter, they can detect its influence by observing how the gravity of massive galaxy clusters, which contain dark matter, bends and distorts the light of more-distant galaxies located behind the cluster. This phenomenon is called gravitational lensing.

Detailed explanation-5: -Einstein’s notebooks indicate that about seven years earlier, he had realised that if an observer was located at the correct distance, the deflected light rays from around the celestial object would converge to make a magnified image. This is a phenomenon known as a strong gravitational lens.