NATS 1740 Lecture 2: OUR STAR
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NATS 1740 Full Course Notes
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Nats 1740a lecture 2 our star. Chemical energy content (is stored in the sun) ~ 10, 000 years (can see how long it lasts) Gravity rolling in balances pressure pushing out. Provided energy that heated the core as the sun was forming. Contraction stopped when fusion started replacing the energy radiated into space. Thermal energy released by fusion in core balance radiative energy lost from the surface. Flow of the charged particles from the surface of the sun. These particles move really fast, constantly every day. It is the surface of the sun; it gets called the surface because it is the last part we see. Energy transported upward by rising hot gas. When the rising hot gas expands, they widen and go to the surface. Chemical and gravitational energy sources could not explain how the sun could sustain its luminosity for more than about 25 million years.
