What Two Physical Effects, Are Required in Order to Understand How We Measure the Speed at Which Galaxies A?

Published June 30, 2010

Question by B P: What two physical effects, are required in order to understand how we measure the speed at which galaxies a?
What two physical effects, are required in order to understand how we measure the speed at which galaxies are moving away from us in the Universe?

Best answer:

Answer by OldPilot
Best guess what your teacher is looking for:

Speed of Light

Doppler shift of the wavelengths of light from the galaxy (Red Shift)

I could be wrong, but that is all I need.

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