AST 2003 Lecture Notes - Lecture 21: Radiation Zone, Galactic Year, Neutrino
Document Summary
Photosphere: prominence- a loop of gas inside the sunspot trapped by the magnetic field; 20000 k. Characteristics: temperature of the sun-5800k (photosphere [the surface]) At this temperature solids and liquids evaporate. This is the reason why the sun is made mostly of gas. The temperature of the core is 15million k = 27 million f: age. Middle aged at 4. 5 billion years" old. The average lifespan is 10 billion years" old: mass loss. 6x 10^11 kg mass loss per second: core. All energy is generated in the core. All the energy is confined in 0. 25 of the radius of the sun in the core. Going to the area outside and above the 0. 25 radius of the sun, the temperature and the pressure is not enough to have h fusion: rotation. 1 day = 26-37 days of earth: density. Of the sun- 0. 2 the density of earth.
