It is the nearest object to which the Lin-Shu density wave theory applies.
Objects near the center of this structure are subject to the "paradox of youth." Bertil Lindblad attempted to explain the dynamics of this structure. It is the nearest object to which the Lin-Shu density wave theory applies. The center of this structure is visible through Baade's Window. The portion of the sky obscured by this structure is called the Zone of Avoidance. The massive radio source called Sagittarius A-Star is located in the center of this structure, which is a member of the Local Group that will eventually collide with Andromeda. For 10 points, name this spiral galaxy in which you currently reside.
Objects near the center of this structure are subject to the "paradox of youth."
the {Milky Way} Galaxy