Transcript for scene 55 of the video " Ice Age 2050s: Certainty 2" by Rolf Witzsche  

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The F-Class stars

The F-Class stars, that are are slightly larger than our Sun and make up 3% of all the stars, are several times more luminous than our Sun, which means that they too, operate in a relatively strong supply system. Those stars may have been the class that was selected for study by the Kepler mission. 

All this means that the stars the size of our Sun, which are up to 5 times dimmer, may be the most vulnerable of the stars to supply fluctuations, but might not have been studied by the Kepler mission, because of their lower intensity.

 

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Published by Cygni Communications Ltd. North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F. Witzsche