How did atmosphere of the planet Uranus form?

Unlike most gas giants, Uranus has a core that is rocky rather than gaseous. The core likely formed first, and then gathered up the hydrogen, helium and methane that make up the planet's atmosphere. read more

A Nice model. Originally, scientists thought that planets formed in the same part of the solar system they live in today. read more

For some planets the moons could've been formed like earth's did: a space rock coming and crashing into the planet, throwing off debris. However, I'm not sure how this would work in Uranus's case as it is a gas giant. read more

Outer Region- Wherein rocks, metals and hydrogen compounds exist as solid frozen flakes but hydrogen and helium are still present as gases where gas planets usually form (e.g. Saturn and Uranus) Outside the frost line, temperatures are low that hydrogen compounds are able to exist as ices (solid). read more