Labels:text | screenshot OCR: THE SUN Solar flare THE SUN IS A 5-billion-year-old main-sequence star. It is a sphere of mainly hydrogen and helium gases, about 1.4 million km (870,000 miles) wide. It contains 750 times the mass of all its planets put together and has seven times the mass of the average star. In its core, nuclear reactions convert mass into electromagnetic radiation, a form of energy. This energy radiates outward, making the Sun shine. It also warms the other objects of the Solar System, which are held in orbit by the Sun's gravity. SOLAR Prominence Sunspot ACTIVITY SEE SURFACE INTERNAL THE SUN'S SOLAR CYCLES PROMINENCES DEATH OF NEXT ALSO FEATURES STRUCTURE ENERGY AND SUNSPOTS AND FLARES THE SUN
