Edwin Hubble was the astronomer which measured the motion of stars in the sky and is therefore denoted as option D.
What is Astronomy?
This refers to an aspect of a science called natural science and is the study of celestial bodies such as the moon, stars etc and the different phenomena which occurs between them.
An astronomer called Edwin Hubble was responsible for the measurement of the motion of stars through when he was in the process of the formulation of his law which involves the determination of distances to galaxies and quasars which is therefore the reason why option D was chosen as the correct choice.
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