Astronomy in Motion: History of the Sun. Less than 5 billion years ago, in a distant spiral arm of our galaxy, called the Milky Way , a small cloud of gas and dust began to compress under its own weight.
Particles within the cloud's center (core) became so densely packed that they often collided and stuck (fused) together. Solar Eclipses. The Sun l Sun Facts and images. Our Sun is a normal main-sequence G2 star, one of more than 100 billion stars in our galaxy. diameter: 1,390,000 km. mass: 1.989e30 kgtemperature: 5800 K (surface) 15,600,000 K (core) History of The Sun.
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