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Biology 10 Online
OpenStudy (anonymous):

When a star moves away from Earth, its electromagnetic spectrum stretches to make its wavelengths appear longer. Which of these methods makes use of this phenomenon to measure accurately the distance from Earth to a star? a. Doppler Effect b. Parallax Method c. HR Diagram d. Blue Shift

OpenStudy (azureilai):

All of them have to do with the changes in frequency of the stars, and etc. But the Parallax Method is the only one that is used to measure distance.

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