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We will answer a viewer's question of “How do we measure distance to stars?” However that question will be answered over the course of 7 videos. The 3rd of 7 video will show that once we know where the star falls on the Color Index Table we can see what the temperature of the star. This video will show how the temperatures on the chart are calculated.

Next video in this series can be seen at:
https://youtu.be/Q0Z1l8FTXPE