The Sun is not made of gas, but rather a giant ball of plasma, which is a superheated state of matter where atoms are stripped of their electrons. This plasma is composed primarily of hydrogen and helium.

Here's how the Sun formed:

1. Gravitational Collapse: A vast cloud of gas and dust in space, called a nebula, began to collapse under its own gravity.

2. Heat and Pressure Build: As the cloud collapsed, the material inside got denser and hotter due to increasing pressure.

3. Nuclear Fusion: At the core of the collapsing cloud, the pressure and temperature reached a point where hydrogen atoms began to fuse together, forming helium and releasing immense amounts of energy. This process is called nuclear fusion.

4. Sun Ignition: The energy released from nuclear fusion created outward pressure that balanced the inward force of gravity, creating a stable star.

Therefore, the Sun wasn't created by gas "getting into space," but rather by the gravitational collapse of a giant cloud of gas and dust, leading to nuclear fusion at its core.