False-color image of HD 12545, a binary RS CVn star with the largest starspot ever observed. The image, created using Doppler imaging, shows the starspot as a large, dark area compared to the sun shown for scale. A temperature scale in Kelvin is provided.
Astronomy Picture from 02/11/2003
A Giant Starspot on HD 12545
Source: https://apod.nasa.gov/apod/ap031102.html
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