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 was used to monitor galaxy motion through changes in sound waves. it indicates a galaxy moving toward earth through red shift. it indicates a galaxy moving away from earth through blue shift.

Explanation:

The Doppler - effect in astronomy is used to measure the velocities of galaxies. Hubble used it to measure galaxy velocities. Red - shift indicates a galaxy moving away from Earth and blue - shift indicates a galaxy moving towards Earth. Also, in space, we deal with light waves (electromagnetic waves) not sound waves as sound cannot travel in a vacuum.

Answer:

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