Indira Gandhi Planetarium, Lucknow Veer Bahadur Singh Planetarium, Gorakhpur        Aryabhatt Planetarium, Rampur

Sun

The Sun is the star at the center of the Solar System. It has a diameter of about 1,392,000 kilometers (865,000 mi), about 109 times that of Earth, and its mass (about 2×〖10〗^30kilograms, 330,000 times that of Earth) accounts for about 99.86% of the total mass of the Solar System. The Sun's color is white, although from the surface of the Earth it may appear yellow because of atmospheric scattering of blue light. Its stellar classification, based on spectral class, is G2V, and is informally designated a yellow star, because its visible radiation is most intense in the yellow-green portion of the spectrum.
In this spectral class label, G2 indicates its surface temperature of approximately 5,778 K (5,505 °C; 9,941 °F), and V (Roman five) indicates that the Sun, like most stars, is a main sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium.
Chemical Composition of the Sun  
Element % of total atoms % of total mass
Hydrogen 91.2 71.0
Helium 8.7 27.1
Oxygen 0.078 0.97
Carbon 0.043 0.40
Nitrogen 0.0088 0.096
Silicon 0.0045 0.099
Magnesium 0.0038 0.076
Neon 0.035 0.058
Iron 0.030 0.014
Sulphur 0.015 0.040
     
     
 
Internal Structure of The Sun  
SUN’s internal structure consists of various lavers as stated below:
1 - CORE
2 - RADIATION ZONE
3 - CONVECTION ZONE
4 - PHOTOSPHERE
5 - CROMOSPHERE
6 - TRANSITION REGION
7 - CORONA