The mass of a single galaxy might be found by
A) the double galaxy method.
B) the rotation curve method.
C) the cluster method.
D) any of these methods.
E) none of these methods.

Question

Quizplus · Accepted Answer

The rotation curve method is the most direct and accurate way to measure the mass of a single galaxy. This involves studying the velocities of objects within the galaxy and using them to derive the mass distribution of the galaxy. The double galaxy method and cluster method are more suited for determining the mass of multiple galaxies, while none of these methods are accurate for determining the mass of black holes.

The Mass of a Single Galaxy Might Be Found by