Timeline of Key Events Event Estimated Timeline Hydrogen Depletion in Core ~5 billion years from now Red Giant Branch Start ~5. At this point, the sun will become a red giant, growing to a size that could reach the orbit of Mars.
Understanding the Sun's Life Cycle and Humanity's Future
Shedding Layers and Planetary Nebula As the red giant phase progresses, the sun will experience intense mass loss through powerful stellar winds. Having already endured for 4.
Helium Accumulation and Core Contraction As the hydrogen in the core depletes, the fusion rate slows down because there is less fuel available. Understanding its lifecycle allows us to contextualize our place in the cosmos and prepare for the distant future.
Understanding the Sun's Life Cycle and Humanity's Future
4 billion years from now. Instead, it will stabilize as a dense, hot remnant known as a white dwarf.
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