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doit_the_clown doit_the_clown
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7 years ago
How do astronomers measure the masses of stars?
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
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
Authors:
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein

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7 years ago
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