The ____ depend(s) on the assumption that the mass of a galaxy or galactic cluster is large enough to keep moving matter bound to the main structure.
A) rotation curve method
B) velocity dispersion and cluster methods
C) Shapley-Curtis and Hubble methods
D) recessional velocity method
E) tangential velocity method

Question

Quizplus · Accepted Answer

The velocity dispersion and cluster methods rely on the assumption that the mass of a galaxy or galactic cluster is significant enough to maintain the gravitational binding of moving matter to the main structure. These methods are used to estimate the mass of galaxies and clusters by observing the speed at which stars or galaxies within those systems move relative to each other.

The ____ Depend(s) on the Assumption That the Mass of a Galaxy