The spatial variation of this quantity in a galactic disk is plotted on a "spider diagram.
The spatial variation of this quantity in a galactic disk is plotted on a "spider diagram." The fact that this quantity does not undergo a Keplerian decline with radius for a spiral galaxy can be explained using either Modified Newtonian Dynamics or dark matter. The value of this quantity is plotted vs distance from the center in a galaxy's rotation curve. One form of this quantity equals the square root of 2 times (*) big G times the mass of an object divided by its radius. This quantity for a galaxy relative to the earth is linearly proportional to its distance from the earth according to Hubble's Law. For 10 points name this quantity whose "escape" version is the value of it required to break free from orbit, whose time derivative gives acceleration.
The spatial variation of this quantity in a galactic disk is plotted on a "spider diagram.
velocity [accept more specific answers like "radial velocity"]