Question

which statement accurately describes how the understanding of the doppler effect is applied to the study of galaxies? it was used by hubble to measure the velocities of galaxies. it indicates a galaxy moving away from earth through blue shift. it indicates a galaxy moving toward earth through red shift. it was used to monitor galaxy motion through changes in sound waves.

Explanation:

The Doppler effect in astronomy uses light shifts: red shift means an object moves away from Earth, blue shift toward it. Hubble used this to study galaxy velocities, but the key application here is identifying motion via shifts. Sound waves don’t apply to galaxies (they use light).

Answer:

A. It was used by Hubble to measure the velocities of galaxies.