The speed of distant ones is governed by Hubble's law, which indicates that on large scales, all of them are moving away from Earth.
Bottom-up theories of their formation involve the accretion of smaller clusters that consist mostly of Population II objects. Their rotation curves indicate that most of their mass is located in their halos, which may be populated by CDM such as WIMPs. The speed of distant ones is governed by Hubble's law, which indicates that on large scales, all of them are moving away from Earth. Blazars are examples of ones with active nuclei, wherein the nucleus is a supermassive black hole. Coming in elliptical, irregular, and spiral types, for 10 points, name these gravitationally-bound collections of stars and dust, such as the Andromeda and Milky Way.
Bottom-up theories of their formation involve the accretion of smaller clusters that consist mostly of Population II objects.
galaxies [or galaxy; accept Andromeda galaxy; accept Milky Way galaxy; accept active galactic nuclei; prompt on “AGNs”] &lt;BH/AS&gt;