Henrietta Leavitt found that the longer a Cepheid's period,
A) the lesser the luminosity.
B) the greater the luminosity.
C) the further away it is.
D) the closer it is.

Question

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Henrietta Leavitt found that the longer a Cepheid's period, the greater its luminosity. This discovery allowed astronomers to accurately measure the distance to other galaxies as Cepheid variable stars served as standard candles.

Henrietta Leavitt Found That the Longer a Cepheid's Period