Multiple Choice
How do astronomers measure the masses of stars directly?
A) by observing the star's brightness at different wavelengths (colors)
B) by observing the motion of two stars in a binary star system
C) by measuring the star's brightness, temperature, and distance
D) by measuring the star's brightness and obtaining its radius using the H-R diagram
Correct Answer:
Verified
Correct Answer:
Verified
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