h2. Sun Facts

h2. !270px-Sun920607.jpg!


* [1 Overview|http://en.wikipedia.org/wiki/Sun#Overview]
* [2 Life cycle|http://en.wikipedia.org/wiki/Sun#Life_cycle]
* [3 Structure|http://en.wikipedia.org/wiki/Sun#Structure]
** [3.1 Core|http://en.wikipedia.org/wiki/Sun#Core]
** [3.2 Radiation zone|http://en.wikipedia.org/wiki/Sun#Radiation_zone]
** [3.3 Convection zone|http://en.wikipedia.org/wiki/Sun#Convection_zone]
** [3.4 Photosphere|http://en.wikipedia.org/wiki/Sun#Photosphere]
** [3.5 Atmosphere|http://en.wikipedia.org/wiki/Sun#Atmosphere]
* [4 Solar activity|http://en.wikipedia.org/wiki/Sun#Solar_activity]
** [4.1 Sunspots and the solar cycle|http://en.wikipedia.org/wiki/Sun#Sunspots_and_the_solar_cycle]
** [4.2 Effects on Earth|http://en.wikipedia.org/wiki/Sun#Effects_on_Earth]
* [5 Theoretical problems|http://en.wikipedia.org/wiki/Sun#Theoretical_problems]
** [5.1 Solar neutrino problem|http://en.wikipedia.org/wiki/Sun#Solar_neutrino_problem]
** [5.2 Coronal heating problem|http://en.wikipedia.org/wiki/Sun#Coronal_heating_problem]
** [5.3 Ultraviolet rays|http://en.wikipedia.org/wiki/Sun#Ultraviolet_rays]
** [5.4 Faint young Sun problem|http://en.wikipedia.org/wiki/Sun#Faint_young_Sun_problem]
* [6 Magnetic field|http://en.wikipedia.org/wiki/Sun#Magnetic_field]
* [7 History of solar observation|http://en.wikipedia.org/wiki/Sun#History_of_solar_observation]
** [7.1 Early understanding of the Sun|http://en.wikipedia.org/wiki/Sun#Early_understanding_of_the_Sun]
** [7.2 Development of modern scientific understanding|http://en.wikipedia.org/wiki/Sun#Development_of_modern_scientific_understanding]
** [7.3 Solar space missions|http://en.wikipedia.org/wiki/Sun#Solar_space_missions]
* [8 Sun observation and eye damage|http://en.wikipedia.org/wiki/Sun#Sun_observation_and_eye_damage]
* [9 Sun in human culture|http://en.wikipedia.org/wiki/Sun#Sun_in_human_culture]
* [10 See also|http://en.wikipedia.org/wiki/Sun#See_also]
* [11 References|http://en.wikipedia.org/wiki/Sun#References]
* [12 External links|http://en.wikipedia.org/wiki/Sun#External_links]