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Which type of variable stars did Hubble use to determine intergalactic distances?
Cepheid variables
Red giant stars
Main sequence stars
White dwarf stars
Answer
Cepheid variables are a type of variable star that pulsates with a regular period. This period is directly related to the star's luminosity, which means that the brighter the star, the longer the period. This relationship allows astronomers to use Cepheid variables as standard candles to measure the distance to other galaxies.
Exploring the Cosmos: Discovering Edwin Hubble's Universe
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