Globular clusters can be used to estimate the distance to galaxies by measuring the clusters' ____.
A) angular diameter
B) mass
C) orbital speed
D) age
E) recession velocity

Question

Quizplus · Accepted Answer

Globular clusters can be used to estimate the distance to galaxies by measuring their angular diameter, utilizing the principle that their physical size is relatively uniform, allowing astronomers to infer distance based on how large they appear in the sky.

Globular Clusters Can Be Used to Estimate the Distance to Galaxies