1. It is thought to have begun 4.6 billion years ago, when a cloud of dust and gas collapsed.
2. The cloud created the solar system, it was called the solar nebula.
3. Scientists think that an outward push of gas pressure, perhaps the explosion of a nearby star
4. The sun probably formed formed from a region that had a mass that was slightly greater than today's mass of the sun and planets.
(hope this helps you)