The helium flash:
{"Image DocumentName": "The helium flash:", "Image ImageDescription": "The pressure within the helium core is almost totally due to electron degeneracy \u2014two electrons cannot be in the same quantum state, so the core cannot contract beyond a certain point. This pressure is almost independent of temperature\u2014when the helium starts fusing, the pressure cannot adjust and expand the gas, which would result in cooling. For hours the temperature increases rapidly until final the normal pressure increases and expansion cools the star again.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}