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What was the other main technique for measuring star distances prior to Leavitt's discovery?
Spectrography
Mass-Luminosity
Parallax and triangulation
Radio Interferometry
Answer
Parallax and triangulation were the two main techniques used to measure the distance to stars prior to Leavitt's discovery. Parallax involves measuring the apparent shift in position of an object as the observer moves. Triangulation involves measuring the angles between three points in order to determine the distance between them.
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