What is the primary phenomenon used to determine distances to the most remote cosmic objects?
Answer
Redshift caused by the expansion of space
For the farthest reaches, the expansion of the universe is the primary ruler. Light traveling from these distant sources is stretched toward the red end of the spectrum due to the expansion of space itself during transit.
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How Do We Measure the Distance to Stars? - YouTube
How Scientists Measure The Distance To Stars and Galaxies
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