An observation of the red shift of galaxies suggestst that the universe is

a. expanding

b. contracting

c. reversing

d. stagnant

A) Expanding. We know this because it has a similar effect with sound. When a car goes by the pitch gets deeper and deeper. It's because you're receiving less waves. Same thing for light but instead of a pitch it's light, and the farther spread the waves - the redder, the closer and more contracted - the bluer