Question: 7. What is the Doppler effect? How did Edwin Hubble conclude that the universe had to be expanding from knowledge of the Doppler effect? Provide

7. What is the Doppler effect? How did Edwin Hubble conclude that the universe had to be expanding from knowledge of the Doppler effect? Provide 3 5 sentences in answering the two questions here. You can also draw pictures if you'd like to help explain matters

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