Twin Quasar

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What Wikipedia says

The Twin Quasar (also known as Twin QSO, Double Quasar, SBS 0957+561, TXS 0957+561, Q0957+561 or QSO 0957+561 A/B), discovered in 1979, was the first identified gravitationally lensed quasar, It is a single quasar that appears in images as two identical quasars as a consequence of gravitational lensing.

Excerpt from the Wikipedia article “Twin Quasar”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Matthias Langer; AIR-WKDo Aylin Esen and Önder Hosgör, FAL, via Wikimedia Commons.