which statement accurately describes how the understanding of the doppler effect is applied to the study of…

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

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

Answer

Answer:

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

Brief Explanations:

The Doppler - effect in astronomy is used to measure galaxy velocities. Hubble used it for this purpose. Galaxies moving away show red - shift, not blue - shift, and those moving towards show blue - shift, not red - shift. Also, in space (where galaxies are), there are no sound waves as sound needs a medium to travel.