That the rotation curves of these objects does not decay as expected is strong evidence for the exis
That the rotation curves of these objects does not decay as expected is strong evidence for the existence of dark matter. Lin and Shu hypothesized that certain structures in these objects were density waves. The center of these objects is often a supermassive black hole; if that black hole has an accretion disk these are said to have an active nucleus. These structures can be classified on Hubble's tuning fork as Irregular, Elliptical, or Spiral, while two nearby dwarf examples are called the Magellanic Clouds. For 10 points, name these large structures examples of which include Andromeda and the Milky Way.
That the rotation curves of these objects does not decay as expected is strong evidence for the existence of dark matter.
{Galaxies} [accept "Spiral galaxies" until "Hubble's tuning fork"]