This effect, known as gravitational redshift, is not specific to black holes. 這種稱做重力紅移的效應，並不是黑洞所特有。
The redshift caused by the expansion is often confused with the more familiar redshift generated by the Doppler effect. 膨脹所造成的紅移，常會和我們比較熟悉的都卜勒效應所產生的紅移搞混。
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