What Allowed Henrietta Levitt to Conclude That the Pulsation Period

question 51

Multiple Choice

What allowed Henrietta Levitt to conclude that the pulsation period of Cepheid variables was related to their intrinsic brightness?

• A) Stars that are farther away appear dimmer.
• B) All Cepheid variables have the same luminosity.
• C) The stars in the Small Magellanic Cloud are nearly the same distance away.
• D) Her stellar models predicted the behaviour of stars in the instability strip.

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