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Tiny Ultra-Faint Dwarf Galaxies Reflect The Conditions In The Early Universe

These screenshots are from simulations aimed at understanding ultra-faint dwarf galaxies in the early Universe. (A) Dark matter distribution in our neighborhood in the Universe, the so called Local Group of galaxies. The two large dark matter halos correspond to those of the Milky Way and Andromeda galaxy; (B) zoom-in on the dark matter in and around a small halo ~700 million years after the Big Bang; (C) stars and gas in the centre of the small dark matter halo in one of our simulations. Credit: J Sureda/A Fattahi/S Brown

The Milky Way has a sizable retinue of dwarf galaxies, and they may hold important clues about conditions in the early Universe. However, they're difficult to observe because many of them are so faint. The tiniest ones are called Ultra-faint dwarf galaxies, and a new simulation aimed at how they form is showing how these faint collections of stars and gas mirror the conditions of the early Universe.



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