Via the Rotation Curve Method, We Can Estimate the Mass $\pi$

question 78

Multiple Choice

Via the rotation curve method, we can estimate the mass of galaxies like M31 from

• A) Doppler shifts of material at the edge of its disk and computing P = 2 \(\pi\)r/v.
• B) the distances of the Doppler shift points from its center.
• C) both answers A and B
• D) It is impossible to estimate the mass of M31.

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