how did hubble tell that galaxies were moving apart from each other
Best Answer: Instruments on Hubble can measure Doppler's Shift of the light of galaxies. If the galaxies are moving away from us there is a Red shift of the light. And at what angle.If the galaxies are moving toward us, there is a Blue shift in the light. And at what angle.Then use semi-complex math to figure how the galaxies are moving in their calculated position in the Universe.est Answer: Instruments on Hubble can measure Doppler's Shift of the light of galaxies. If the galaxies are moving away from us there is a Red shift of the light. And at what angle.