Our sun will become a red giant in about five billion years.
Over the course of their"normal" lives, the outward pressure of fusion inside main sequence stars balances out the inward pressure of gravity. Once the core fusion stops, however, gravity takes over and begins compressing the star.
Red giant stars bloat to 62 million to 620 million miles in diameter — 100 to 1,000 times wider than our sun is today. Because these stars' energy is spread across such a large area, their surface temperatures are actually relatively cool, reaching only 4,000 to 5,800 degrees Fahrenheit , a little over half as hot as the sun.
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