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doit_the_clown doit_the_clown
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7 years ago
What is the only way to measure the mass of a star accurately?
A)   Measure its distance using trigonometric parallax and its brightness using photometry
B)   It is not possible to measure the mass of a star.
C)   Measure its spectral type and luminosity class, then use the H-R diagram
D)   Measure its gravitational effect on another object
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
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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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discovererdiscoverer
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7 years ago
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doit_the_clown Author
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7 years ago
Helped a lot
TAT1238
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Yesterday
This helped my grade so much Perfect
dri
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2 hours ago
Brilliant ツ
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