​ESA’s Euclid Telescope Discovers Rare Einstein Ring

On 10th February 2025, the European Space Agency’s (ESA) Euclid space telescope unveiled a rare Einstein ring around galaxy NGC 6505, located 590 million light-years from Earth. This extraordinary cosmic phenomenon, named Altieri’s Ring, was first noticed in September 2023.

What is an Einstein Ring?

  • An Einstein ring is a perfect circle of light formed due to gravitational lensing; a phenomenon predicted by Albert Einstein’s general theory of relativity.
  • This occurs when a massive galaxy or dark matter distorts and amplifies light from a distant galaxy behind it, making it appear as a ring.

Why is Altieri’s Ring Special?

  • It’s the ....
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