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    The Young Milky Way Collided With a Dwarf Galaxy

    Reprinted with permission from Quanta’s Abstractions blog. As the Milky Way was growing, taking shape, and minding its own business around 10 billion years ago, it suffered a massive head-on collision with another, smaller galaxy. That cosmic cataclysm changed the Milky Way’s structure forever, shaping the thick spirals that spin out from the supermassive black hole […]

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    There May Be Two Trillion Other Galaxies

    In 1939, the year Edwin Hubble won the Benjamin Franklin award for his studies of “extra-galactic nebulae,” he paid a visit to an ailing friend. Depressed and interred at Las Encinas Hospital, a mental health facility, the friend, an actor and playwright named John Emerson, asked Hubble what—spiritually, cosmically—he believed in. In Edwin Hubble: Mariner […]

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    How to Map a Galaxy When You’re Right in the Middle of It

    The barred spiral galaxy UGC 12158 probably looks similar to how the Milky Way does from the outside. http://www.spacetelescope.org/images/potw1035a/ ESA/Hubble & NASA The T-shirts and posters are common: an image of a galaxy, an arrow pointing to a spot in that galaxy, and a sign reading “You are here.” But it’s all a big lie. […]

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    Seeing the Galactic Forest for the Trees

    To solve a mystery, scientists often zoom in on it as close as they can, break the puzzling system down to its components, and analyze it piece by piece. Sometimes, comprehending a system requires just the opposite: pulling back to see the bigger picture. Sometimes that bigger picture is bigger than our galaxy, in which […]