Why does the Milky Way have spiral arms? New Gaia data are helping solve the puzzle | Space - discu.eu

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Since the 1950s, astronomers have known that the Milky Way looks like a spiral, with several dense streams of stars emanating from the center, winding through the galactic disc and dissolving around its edges. However, scientists have struggled to understand how many, and what created them. https://www.space.com/gaia-reveals-spiral-arms-milky-way 8 comments 30/7/2021 space

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