about sun

The Sun is the star at the center of the Solar System- is a yellow dwarf star, a hot ball of glowing gases. It is a nearly perfect sphere of hot plasma. Its gravity holds the solar system together. The sun was born about 4.6 billion years ago. Many scientists think the sun and the rest of the solar system formed from a giant, rotating cloud of gas and dust known as the solar nebula The Sun is the largest object within our solar system, comprising 99.8% of the system’s mass.The Sun is the source of an enormous amount of energy, a portion of which provides Earth with the light and heat necessary to support life.The Sun exists in the outer part of the Milky Way Galaxy and was formed from mate rial that had been processed inside a supernova. The radius of the Sun, R☉, is 109 times that of Earth ! The surface viewed from Earth, called the photosphere, is the layer from which most of the radiation reaches us. The sun has enough nuclear fuel to stay much as it is now for another 5 billion years. After that, it will swell to become a red giant.