The Biggest Known Galaxy Is 1.7 Million Light-Years, And We Can’t Comprehend The Scale
Literally huge.
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Astronomers have determined that IC 1101, a colossal galaxy located within the Abell 2029 cluster, stretches approximately 1.7 million light-years across, making it the largest known galaxy to date. This measurement significantly exceeds previous estimates and represents the most precise determination of the galaxy’s physical dimensions to date. The sheer scale defies conventional understanding—the galaxy is roughly twenty times larger in diameter than our own Milky Way and would nearly bridge the gap between our galaxy and Andromeda if positioned between them.
Using advanced imaging technology from the Isaac Newton Telescope, researchers led by astrophysicist Carlos Marrero de la Rosa obtained the deepest observations of IC 1101 ever captured. The team painstakingly removed scattered light and glare that had previously obscured the galaxy’s true boundaries. By analyzing multiple properties simultaneously—including light distribution, stellar color, mass, and shape—they identified the precise edge of IC 1101’s main stellar body at approximately 260 kiloparsecs from its center.
Despite having a defined edge, IC 1101 continues to grow. The researchers discovered faint structures surrounding the galaxy that appear to be remnants of past interactions with smaller galaxies and ongoing material accumulation. These findings suggest that IC 1101 expands through galactic cannibalism, absorbing neighboring systems over billions of years. The discovery provides insights into how galaxies of extraordinary magnitude develop and continue evolving within the cosmos.
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Originally reported by Sciencealert →
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