Gas planets

1.Why gas planets are far from the Sun?

Rock planets are close to the sun. But gas planets are far from the Sun. Rock planets' space is hotter than gas planets' space. So in rock planets' space, many meterials are less intergrated than gas planets' space. So Jupiter, Saturn, Uranus, Neptune is bigger than Mercury, Venus, Earth, Mars.

2.How did gas planets created?

Maybe you learned that Gas planets don't have surface that you can walk. But if we go to inner of Gas planets' atmosphere,  we can find a planet that have a liquid surface. Maybe liquid is created by gas' pressure. Liquid was maybe a gas. Maybe Jupiter,Saturn,Uranus,Neptune were rock planets. But because of their strong gravity, they have very big atmosphere. And it would became gas planets.