What will a star similar in size to the Sun become after it runs out of hydrogen?
Answer
Red Giant
As hydrogen is depleted in the core, the balance between gravity and internal pressure shifts, causing the core to collapse and heat up while the outer layers expand and cool down. This expansion causes the star to swell significantly in size, turning into a Red Giant. Although the surface is cooler than it was during the main sequence, the massive surface area allows it to continue emitting a high level of light.
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