Giant radio galaxy Alcyoneus is now the largest known galaxy in the Universe. Move over, IC 1101. You may be impressively large, but you never stood a chance against the largest known galaxy : Alcyoneus. Currently, it is the largest galaxy discovered, with a width of around 5 million parsecs (16.3 million light-years). It is the largest known structure created by a single galaxy. Active black holes create jets, which excite gas and trigger emissions. Giant radio galaxies possess lobes: the largest galactic structures of all. In 2022, astronomers identified lobes emitted from giant radio galaxy Alcyoneus. They span 16,000,000 light-years in extent, breaking all prior records. The galaxy is around 3 billion light-years away from Earth and is roughly 16.3 million light-years long. At 16.3 million light-years wide, the Alcyoneus galaxy has a diameter 160 times wider than the Milky Way and four times that of the previous title holder, IC 1101, which spans 3.9 million light-years, researchers reported in a new study. The largest known galaxy has been discovered by astronomers — measuring in at a whopping 153 times the size of our own Milky Way. Named Alcyoneus, the galaxy is around 3 billion light-years away from Earth and is roughly 16.3 million light-years long. By comparison, the Milky Way is just under 106,000 light-years long. While IC 1101 still holds the record for the largest galaxy in terms of the extent of its stars, Alcyoneus is 230% as long as measured from end-to-end.

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