The period-luminosity relation for Cepheid variables was discovered in 1908 by:
A)William Herschel.
B)Henrietta Leavitt.
C)Harlow Shapley.
D)Heber Curtiss.
E)Edwin Hubble.

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Henrietta Leavitt discovered the period-luminosity relation for Cepheid variables in 1908 while she was working at the Harvard Observatory. The period-luminosity relation for Cepheid variables was discovered by Henrietta Leavitt in 1908, while working at the Harvard College Observatory.

The Period-Luminosity Relation for Cepheid Variables Was Discovered in 1908