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Question

The Hertzsprung-Russell Diagram

A
is based on the principle that the intrinsic brightnesses of most stars are related to their temperatures.
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B
most stars have the same temperature.
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C
was developed in the 1950s by two American astronomers working for NASA.
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D
while of great utility for most large stars, has proven of little value in classifying small stars like our sun.
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Solution

The correct option is B is based on the principle that the intrinsic brightnesses of most stars are related to their temperatures.
HR diagram plots each star on a graph measuring the star's brightness against its temperature (color). It does not map any locations of stars.

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