Final answer:
The two things that balance to maintain the shape of a star are pressure and gravity.
Step-by-step explanation:
What two things balance to maintain the shape of a star?
The two things that balance to maintain the shape of a star are pressure and gravity. Pressure is generated by the nuclear reactions in the star's core, causing an outward force, while gravity pulls inward. These two forces balance each other, resulting in the star maintaining its shape and preventing it from collapsing or expanding uncontrollably.
For example, in the core of a star like our Sun, the immense gravitational pressure causes hydrogen atoms to fuse together, releasing a tremendous amount of energy in the form of light and heat. This energy pushes against the force of gravity, creating an equilibrium that maintains the star's size and shape.
In summary, the balance of pressure and gravity is essential for a star to maintain its shape and prevent its collapse or expansion.
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