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.
Also asked, how the solar system was formed?
Scientists believe that the solar system was formed when a cloud of gas and dust in space was disturbed, maybe by the explosion of a nearby star (called a supernova). This explosion made waves in space which squeezed the cloud of gas and dust.
How the gas planets were formed?
Artist's conception of our solar system's solar nebula, the cloud of gas and dust from which the planets formed. The core accretion model suggests that the rocky cores of planets formed first, then gathered lighter elements around it to form its crust and mantle.
When did all the planets form?
The formation and evolution of the Solar System began 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud.
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