What is a yellow dwarf?
yellow dwarf is the type of star the main sequence, more precisely called the main sequential star of the G. The sun is a typical star of a yellow dwarf. Yellow dwarf weighs between 80 and 120 percent of the mass of the Earth's sun. These stars differ in color from white to light yellow. The sun is actually white, but it looks yellow from the Earth's surface, because its light is scattered in the atmosphere.
Although dwarves are called, this term is used only compared to the colossal size of giant stars. Yellow dwarves are becoming greater than the vast majority of stars in the galaxy, most of which are smaller, colder orange or red dwarves. The sun has a volume of approximately 1,412,000,000,000,000,000 kilometers and a weight of approximately 1,989,199,100,000,000,000,000,000,000,000 kilograms, which is 1300,000 times larger than the Earth and 332,900 times massive. It consists of about 75 percent of hydrogen. Most of the rest are helium and several other elements such as oxygen, carbon and iron, in trace quantities.
Yellow dwarf is the main sequential star that produces energy by converting hydrogen into helium through a nuclear fusion in the nucleus. The external pressure produced by this energy is exported by the force of the star gravity and creates a state called hydrostatic balance that prevents the star from collapse or explodes. Every second, the Sun is associated with about 600,000,000,000,000 kilograms of hydrogen into helium and converts about 4,000,000 kilograms of mass to energy. Most of this energy is in the form of heat, which is gradually transmitted towards the surface of the stars, where it is released as electromagnetic radiation, including visible light and kinetic energy. This produces temperatures between 5,000 and 6,000 ° Kelvin on the surface and core up to 15,000,000 ° Kelvin.
Yellow dwarf remains on the main sequence for the Around ten billion years, slowly ages. Since increasingly hydrogen in the core of the star is converted into a helium, coreIt tightens and grows warmer until its energy performance has overcome its own gravity of the star. At this time, the star begins to expand, leaves the main sequence and becomes a red giant that eventually develops in a white dwarf. Yellow dwarf stars are not massive enough to become supernova or black openings. The sun is currently about the middle of the main sequence of its life.
yellow dwarf stars are quite common and make up about 7.5 percent of stars in the Milky Way galaxy. Yellow dwarf can be lonely as the sun or part of the binary or multi -star system. Well -known yellow dwarves visible from the ground with the naked eye include Alpha Centauri and Tau Ceti.