The Sun, the heart of our solar system is a yellow dwarf star, a hot ball of glowing gases. Our Sun is a natural main-sequence G2 star, one of more than 100 billion stars in our galaxy. The Sun Profile: Diameter: 1,390,000 km.  Mass: 1.989e30 kg  Temperature: 5800 K (surface) 15,600,000 K (core) (1) Do … Continue reading Across the sea of space, the stars are other suns