What begins the process of the solar system

The various planets are thought to have formed from the solar nebula, the disc-shaped cloud of gas and dust left over from the Sun's formation. The currently accepted method by which the planets formed is accretion, in which the planets began as dust grains in orbit around the central protostar.

Solar system is the collection of eight planets including Sun, Mars, Venus, Earth, jupiter, Mercury, Uranus and Neptune. They all are revolving around the elliptical orbit. Solar system was formed when cloud of gas and dust was distributed in space. Solar system involves some steps like Nebula collapsing, rotating protostellar disk, center of nebula fusion begins, star is born and planets form.

Solar system was about 4.6 billion years old. It forms by gravity in molecule cloud.