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What type of variable's luminosity and pulsation period did Hubble use for scaling distances?
Classical Cepheid
Gamma Ray Bursts
Red Giants
Supernovae
Answer
Classical Cepheids are a type of variable star that pulsates with a regular period. Their brightness changes over time, and this can be used to estimate their distance from Earth. Edwin Hubble used classical Cepheids to measure the distance to nearby galaxies, and this helped him to establish that the universe is expanding.
Exploring the Cosmos: Discovering Edwin Hubble's Universe
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