What is an Einstein Ring?

The European Space Agency’s (ESA) Euclid space telescope has discovered a rare Einstein ring around NGC 6505, a galaxy located nearly 590 million light-years away from Earth.

What is an Einstein Ring?

• An Einstein ring appears as a bright central light with a cloudy, circular ring around it. It is a direct consequence of gravitational lensing, a phenomenon where a massive celestial body—such as a galaxy or a cluster of galaxies—bends and amplifies the light from distant objects behind it, due to its intense gravitational field.
• Named After: Albert Einstein, whose General Theory of Relativity predicted that light could be bent by strong gravitational fields.
• First Einstein Ring: Discovered in 1987.
• Discovery Significance: Since then, multiple Einstein rings have been found, contributing to our understanding of dark matter, galaxy formation, and cosmic structure.

Role of NGC 6505

• In this case, the galaxy NGC 6505, first discovered in the 19th century, serves as the gravitational lens. The bending of light caused by NGC 6505 has resulted in the formation of the newly identified Einstein ring.

(Source: Indian Express)