i’m 1927 on mount wilson outside pasadena, california edwin hubble observed hydrogen spectra from distant galaxies that were red shifted. what was the change in the waves that he observed? what caused this change? what periodic phenomenon was this?

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The Mount Wilson Observatory (MWO) is an astronomical observatory in Los Angeles County, California, United States. The MWO is located on Mount Wilson, a 1,740-metre (5,710-foot) peak in the San Gabriel Mountains near Pasadena, northeast of Los Angeles.