The outer layer fall onto the core due to gravity.
The gravity of a star holds a sphere of gas together.
The struggle a star faces to survive is one of persistent resistance to gravity. The star is constantly being pushed toward collapse by gravity. However, the star's core is extremely hot, which exerts pressure on the gas. The star enters a state of equilibrium known as hydrostatic pressure when this pressure balances out the gravitational force. As long as a star maintains this balance between pressure pushing it forth and gravity drawing it in, it will function normally.
The star reaches the end of its main sequence life when its nuclear fuel runs out. If the star is big enough, it can generate internal heat through a series of inefficient nuclear processes. However, eventually these reactions won't provide enough heat to keep the star from collapsing due to its own gravity.
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