Who among the following discovered the relationship between the intrinsic brightness of a variable star and the time it took to vary in brightness, making it possible for others to estimate the distance of these faraway stars, conclude that additional galaxies exist, and begin mapping the Universe?

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Q. Who among the following discovered the relationship between the intrinsic brightness of a variable star and the time it took to vary in brightness, making it possible for others to estimate the distance of these faraway stars, conclude that additional galaxies exist, and begin mapping the Universe?

[A] Kepler

[B] Edwin Hubble

[C] Henrietta Leavitt

[D] Laplace

Answer: C

Notes:

Henrietta Leavitt discovered the relationship between the intrinsic brightness of a variable star and the time it took to vary in brightness, making it possible for others to estimate the distance of these faraway stars, conclude that additional galaxies exist, and begin mapping the Universe.

Source: https://www.khanacademy.org/humanities/big-history-project/big-bang/how-did-big-bang-change/a/henrietta-leavitt.

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