The General Purpose Heat Source
![The General Purpose Heat Source](https://planetary.s3.amazonaws.com/web/assets/pictures/_1200x861_crop_center-center_82_line/gphs-diagram.jpg 1200w, https://planetary.s3.amazonaws.com/web/assets/pictures/_768x551_crop_center-center_82_line/gphs-diagram.jpg 768w, https://planetary.s3.amazonaws.com/web/assets/pictures/_576x413_crop_center-center_82_line/gphs-diagram.jpg 576w)
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