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The measurement of cosmic distances was helped tremendously by the discovery, in the early part of the 20th century, that in Cepheid variable stars, the average luminosity was related to:

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In the early 20th century, the average luminosity in Cepheid variable stars was related to: the period of time it takes to vary.

What is a cosmic distance?

A cosmic distance can be defined as an accurate and precise measurement of the distance to celestial or astronomical objects such as:

  • Galaxies
  • Stars
  • Moon
  • Sun

In the early 20th century, a discoery of the average luminosity in Cepheid variable stars was related by astronomers to the period of time it takes to vary and this helped tremendously in the measurement of cosmic distances.

Read more on cosmic distance here: https://brainly.com/question/23428619

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