Question

how were the planets were formed

Answer 1

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.
____________________

Answer 2

the various planets are thought to have formed from the solar nebula the disc shaped cloud of gases and dust left over from the sun's formations