About the Book
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 157. Chapters: Incandescent light bulb, Bunsen burner, Sun, Star, Supernova, Aurora, Lists of stars, List of brightest stars, Laser diode, Triboluminescence, Fireworks, Sonoluminescence, Flamethrower, Arc lamp, Electroluminescence, Sunlight, Gegenschein, Corona, Photosphere, Zodiacal light, Light pollution, Cathodoluminescence, Incandescence, Meteorite fall, Ceremonial use of lights, Flash, Glow stick, Christmas lights, Campfire, Cherenkov radiation, Neon lamp, Bioluminescence, X-rays from the Moon, Synchrotron light source, Upper-atmospheric lightning, Gas-discharge lamp, Flashlight, Skyglow, Backlight, Airglow, Havells Sylvania, Planetshine, Fireplace, Muzzle flash, Ashen light, Great Comet, Earthquake light, List of light sources, Solar transition region, List of supernova remnants, Limelight, Starlight, Moonlight, Polilight, Dry lightning, LVX, Fire pan, Mechanoluminescence, Earthlight, Crystalloluminescence, Lava fountain. Excerpt: The Sun is the star at the center of the Solar System. It is almost perfectly spherical and consists of hot plasma interwoven with magnetic fields. It has a diameter of about 1,392,000 km, about 109 times that of Earth, and its mass (about 210 kilograms, 330,000 times that of Earth) accounts for about 99.86% of the total mass of the Solar System. Chemically, 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 oxygen, carbon, neon, iron, and others. The Sun's stellar classification, based on spectral class, is G2V, and is informally designated as a yellow dwarf, because its visible radiation is most intense in the yellow-green portion of the spectrum and although its color is white, from the surface of the Earth it may appear yellow because of atmospheric scattering of blue light. In the spectral class la...