Astronomy 1021 Lecture Notes - Lecture 14: Photosphere, Cyanoacrylate, Radiography
4 Oct 2018
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Document Summary
1 kg of matter to 100 000 trillion (10^17) watts of energy. Note that temperature and pressure increase with depth. Temperature: a measure of how fast the particles are moving. Plasma: another state of matter where gas is hot enough that particles are ionized (i. e. electrons are stripped) Pressure: 200 billion times that on earth"s surface. Similar to pattern on the surface of hot coffee. Can be observed in uv, x-ray, or in visible light. Only 1 part in 10^14 of the sun"s mass lost per year. Mass of four h particles < mass of one he particle. 600 billion kg of h fused per sec. 270 000 years to fuse through equivalent mass of earth. Sun has enough mass to last 10 billion years. 1s of sun"s total energy would supply our energy needs for 500 000 years. Sun"s fusion remains stable thanks to a negative feedback loop. Not enough photons emitted from the sun to match models.
