What does the doppler effect tell scientists about the universe?
The Doppler effect causes objects that are moving towards an observer to increase in frequency while those that move away from an observer decrease in frequency. In 1920s and 1930s, Edward Hubble was measuring the doppler shift of various stars in the night sky, and discovered that there were fa more shifted towards the red spectrum (lower frequency) then the blue spectrum (higher frequency). Hubble concluded from this fact that the universe is constantly expanding outwards, and formulated Hubbles Law to approcimate the rate of universal expansion.
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