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Astronomers have released a new map of the outermost region of our galaxy.
Known as a galactic halo, this area lies outside the swirling spiral arms that make up the Milky Way’s recognizable central disk, and is sparsely populated with stars.
Though the halo may appear mostly empty, scientists predict it contains a massive reservoir of dark matter, an invisible material thought to make up the bulk of all mass in the universe.
The new map, which appears as part of a paper in
Nature, reveals how a small galaxy called the Large Magellanic Cloud so-named because it is the larger of two dwarf galaxies orbiting the Milky Way has sailed through the galactic halo like a ship through water, its gravity disturbing the halo and creating a wake in the stars behind it as it orbits the Milky Way some 130,000 light-years from Earth.
Astrophysicists Help Chart Dark Matter s Invisible Ocean A wake of stars, created by a small galaxy set to collide with the Milky Way, is the highlight of a new map of the Milky Way s outer reaches. The observations confirm predictions made by a group of UArizona astronomers whose computer simulations test theories explaining the mysterious nature of dark matter. By Daniel Stolte, University Communications April 21, 2021 Images of the Milky Way and the Large Magellanic Cloud (LMC) are overlaid on a map of the surrounding galactic halo. The smaller structure is a wake created by the LMC’s motion through this region. The larger light-blue feature corresponds to a high density of stars observed in the northern hemisphere of our galaxy.