Color of the shift that scientists study to determine the distance of a quasar from earth

Please see below the Color of the shift that scientists study to determine the distance of a quasar from earth answer and solution. This clue is part of the Jeopardy Words Daily Challenge and was last seen on September 5 2020. The Jeopardy Daily Challenge is an addictive word puzzle game where you are given 4 clues every single day and you have to correctly find the answers.

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