Depictions of the Milky Way show a coiling pattern of spiral "arms" filled with stars extending outward from the center. Similar patterns have been observed in the swirling clouds of gas and dust surrounding some young stars – planetary systems in the making. These so-called protoplanetary disks, which are the birthplaces of young planets, are of interest to scientists because they offer glimpses into what the solar system may have looked like in its infancy and into how planets may form in general.

https://www.miragenews.com/elusive-planet-found-creating-spiral-arms-1042092/

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