The two-armed phase spiral seen in Gaia's inner-disk stars is likely the overlap of two one-armed spirals created by two external perturbations separated by roughly 180 Myr.
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Formation of the Two-Armed Phase Spiral from Multiple External Perturbations
The two-armed phase spiral seen in Gaia's inner-disk stars is likely the overlap of two one-armed spirals created by two external perturbations separated by roughly 180 Myr.