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The Milky Way contains hundreds of billions of stars spread across one hundred thousand light-years of space. It takes light itself, the fastest thing in the universe, a full hundred thousand years just to cross it. By every human measure, our galaxy is incomprehensibly vast. But it is not even close to the largest. There are galaxies so enormous that the entire Milky Way could fit inside them dozens of times over and vanish without a trace. These are the giant elliptical galaxies, ancient, featureless clouds of trillions of old stars stretching millions of light-years across, sitting at the gravitational centers of massive galaxy clusters. They look nothing like our galaxy. No spiral arms. No bright blue stars being born. No dust lanes. Just a vast, softly glowing monument of consumed starlight. And the most unsettling part is how they got that way. They did not build their stars from scratch. They grew by devouring other galaxies, tearing them apart, absorbing their stars, and adding their mass to an ever-growing structure with no natural reason to stop. This process, called galactic cannibalism, is not ancient history. It is happening right now. Our own Milky Way is actively consuming smaller galaxies as you read this. And in roughly four and a half billion years, our galaxy itself will be consumed when it collides and merges with Andromeda. This video takes you on a scale journey from the Milky Way through Andromeda, past the largest spirals ever measured, and into the realm of the supergiant ellipticals, galaxies like IC 1101, NGC 4889, and the monsters at the hearts of the most massive galaxy clusters in the observable universe. You will learn how mergers destroy spiral structure, why stars almost never collide even when galaxies do, how astronomers read the fossil record of consumed galaxies written in shells and tidal streams, and why the biggest galaxies in the universe will never stop growing. Sources: De Lucia, G. & Blaizot, J. (2007). "The hierarchical formation of the brightest cluster galaxies." Monthly Notices of the Royal Astronomical Society, 375(1), 2-14. https://doi.org/10.1111/j.1365-2966.2006.11287.x Toomre, A. & Toomre, J. (1972). "Galactic Bridges and Tails." The Astrophysical Journal, 178, 623-666. https://doi.org/10.1086/151823 Belokurov, V., Zucker, D.B., Evans, N.W. et al. (2006). "The Field of Streams: Sagittarius and Its Siblings." The Astrophysical Journal Letters, 642(2), L137-L140. https://doi.org/10.1086/504797 Kormendy, J. & Ho, L.C. (2013). "Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies." Annual Review of Astronomy and Astrophysics, 51, 511-653. https://doi.org/10.1146/annurev-astro-082708-101811 Tal, T. et al. (2009). "The Frequency of Tidal Features Associated with Nearby Luminous Elliptical Galaxies from a Statistically Complete Sample." The Astronomical Journal, 138(5), 1417-1427. https://doi.org/10.1088/0004-6256/138/5/1417 #BiggestGalaxies #GalacticCannibalism #IC1101 #GiantEllipticalGalaxies #MilkyWay #UniverseScale #SpaceDocumentary
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