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Four Spiral Arms Walk into a Bar…

7 Apr 2021, 11:00 UTC
Four Spiral Arms Walk into a Bar… NASA/JPL-Caltech/ESO/R. Hurt

The Milky Way Galaxy is our home, and yet we don’t have a very clear picture of how it is structured. We know that we live inside a barred spiral galaxy, but how many spiral arms does our Galaxy have? Where are they located? How tightly are they wound?

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