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Henrietta Leavitt measured the change in brightness of 25 Cepheids in the Small Magellanic Cloud, which is a small irregularly-shaped galaxy on the outskirts of the Milky Way. Comparing the graph the average magnitude of each star with a period of change in its brilliance, Henrietta Leavitt discovered that magnitude has been steadily increasing with the increase of the modification period. Although at the time the distance to the LMC was not known, Leavitt knew that all the stars in it are about the same distance from the Sun (in a similar way it can be said that every citizen of New - York is located at approximately the same distance from the observer in England). Hence Leavitt came to the conclusion that the average Cepheid absolute luminosity increases with the period of change in its brilliance.

轉世暗號 by 衛斯理 (倪匡)

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衛斯理 (倪匡)
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