Requires very precise measurements of stellar positions, and long baselines

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Trigonometric Parallax

2) The Standard Candle

Cepheid Variable Stars

  • There is a kind of giant star whose surface pulsates in and out with a regular period. That period of pulsation is related to the Luminosity of the star.

  • LMC contains hundreds of known Cepheids all at the same distance. Which allows for robust determination of the Period Luminosity Relationship.

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