| Beautiful orrery(solar system model) avaiable in : www.orrerystore.com .Documentary About The Sun, Earth and Universe. The Sun is the star at the center of the Solar System. It has a diameter of about 1392000 kilometers (865000 mi), about 109 times that of Earth, and its mass (about 2 × 1030 kilograms, 330000 times that of Earth) accounts for about 99.86% of the total mass of the Solar System.[10] About three quarters of the Sun's mass consists of hydrogen, while the rest is mostly helium. Less than 2% consists of heavier elements, including iron, oxygen, carbon, neon, and others.The Sun's color is white, although from the surface of the Earth it may appear yellow because of atmospheric scattering.Its stellar classification, based on spectral class, is G2V, and is informally designated a yellow star, because the majority of its radiation is in the yellow-green portion of the visible spectrum.In this spectral class label, G2 indicates its surface temperature of approximately 5778 K (5505 °C; 9941 °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. In its core, the Sun fuses 430--600 million tons of hydrogen each second.The Sun is currently traveling through the Local Interstellar Cloud in the Local Bubble zone, within the inner rim of the Orion Arm of the Milky Way galaxy. Of the 50 nearest stellar systems within 17 light-years from Earth, the Sun ... |
