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Cool gas absorbs light - PowerPoint PPT Presentation

The Magnitude Scale

The Magnitude Scale. A measure of the apparent brightness Logarithmic scale Notation: 1 m .4 (smaller ? brighter) Originally six groupings 1 st magnitude the brightest 6 th magnitude is 100x dimmer So a difference of 5mag is a difference of brightness of 100

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Finding the absolute Magnitude

Finding the absolute Magnitude. To figure out absolute magnitude, we need to know the distance to the star Then do the following Gedankenexperiment: In your mind, put the star from its actual position to a position 10 pc away

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Cool gas absorbs light - PowerPoint PPT Presentation

The Magnitude Scale

Finding the absolute Magnitude