Astronomers Finds “Spine” Along Spiral Arms of the Milky Way

Astronomers have found what may be considered a piece of a galactic skeleton; a dark structure of gas and dust that might provide a backbone on which one of the spiral arms extend from the central bar of the Milky Way galaxy.

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https://www.universetoday.com/99337/astronomers-find-a-spine-along-spiral-arms-of-the-milky-way/