Because of the great masses and speeds involved, Newton's laws are useless in measuring the mass of a galaxy.

Name: Because of the great masses and speeds involved, Newton's laws are useless in measuring the mass of a galaxy.
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Quizplus · Accepted Answer

Newton's laws, especially the law of universal gravitation, are fundamental in calculating the mass of galaxies by observing the motion of stars and gas within them, indicating these laws are not useless but essential for such measurements.

Because of the Great Masses and Speeds Involved, Newton's Laws