One of the original motivations for Modified Newtonian Dynamics was the asymptotically flat rotation curves of these objects.
Although not Saturn's rings, the density wave theory of Lin and Shu was developed to explain these objects. These objects have low positive values in the numerical Hubble stage. One of the original motivations for Modified Newtonian Dynamics was the asymptotically flat rotation curves of these objects. The luminosity of these objects is empirically correlated with their velocity width according to the Tully-Fisher relation. These objects are found on the tongs of the Hubble tuning fork and have a central bulge, halo, and rotating disc. For 10 points, identify this type of galaxy that can be "barred" and which includes the Milky Way.
Although not Saturn's rings, the density wave theory of Lin and Shu was developed to explain these objects.
{spiral galaxies} [prompt on lenticular galaxies; accept {spiral arms} before "Hubble stage"]