In 5 Billion Years, the Sun Will Become a Red Giant — Here’s What That Means for Earth
2025/07/20
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The Sun, our steadfast source of light and energy, has shone brightly for over 4.5 billion years. Yet, like all stars, it too has a life cycle — and in about 5 billion years, its current phase will end. As the Sun exhausts the hydrogen fuel in its core, it will leave behind its stable main-sequence life and transform into a massive red giant, forever changing the solar system as we know it.
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This dramatic evolution is not only a natural stage of stellar life for medium-sized stars like our Sun, but also a sobering reminder of the impermanence and dynamism of the cosmos.
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