What can you see now?

Yellow color -> spectrum peaks around 500 nm -> temperature is about 6000 K

Wien's Law: Temperature = 0.29 cm / maximum wavelength


Temperature + Luminosity -> Radius = 700,000km

Stefan's Law: Luminosity = Area X sigma X Temperature4


What about Sun Spots?




What do the X-rays tell us?




What do the lines tell us?

The Sun is composed of 71% Hydrogen, 27% Helium, 2% CNO...Fe