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Which specific Cepheid's period-luminosity relation did Leavitt establish?
Heat-period relation
Mass-period relation
Luminosity-period relation
Density-period relation
Answer
The Cepheid period-luminosity relation, also known as Leavitt's law, is a relationship between the luminosity and period of Cepheid variables. It was discovered by Henrietta Leavitt in 1912 and was the first of the two main scaling relations that form the foundation of modern extragalactic astronomy. The other is the Hubble law, which relates the distance to a galaxy to its recession velocity.
The Stellar Saga: Unraveling Henrietta Swan Leavitt's Cosmic Legacy
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