What Is the Doppler Effect?

By jamie

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5. Expanding Universe

It used to be thought that the universe was static. Even the late, great, Alfred Einstein thought that this was true. It was thanks to the doppler effect, however, that famous Scientist Edwin Hubble was able to tell us in 1929 that the universe is indeed expanding. Hubble was able to achieve this by examining the light waves coming from distant objects in the universe.

In doing so, he discovered that the light was red-shifted, meaning that the wavelength of light was being stretched out. This could only mean one thing that these objects are actually moving away from us and that the entire universe is expanding.

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