The energy produced in this core process is what creates the solar wind and the heliosphere, protecting our solar system from some cosmic rays. Core Hydrogen Depletion and Expansion As the hydrogen in the core is exhausted, the balance shifts.
The Sun's Astronomical Timeline: From Main Sequence to Stellar Remnants
The Final Acts: Planetary Nebula and Stellar Remnants Once the red giant phase concludes, the Sun will shed its outer layers into space, creating a spectacular planetary nebula. The Current Phase: Main Sequence Stability For the vast majority of its life, a star like our Sun exists in the main sequence phase.
The Sun's demise is not an isolated event but part of a universal cycle. During this expansion, the Sun's radius will grow so large that it will likely engulf the orbits of Mercury and Venus, and possibly even reach the Earth's current position, rendering the planet uninhabitable long before physical contact.
Sun's Evolution: From Main Sequence to Planetary Nebula and White Dwarf
White Dwarf Cooling: The remnant core will persist for longer than the current age of the universe. This phase will not last forever, and the transition out of it marks the beginning of the Sun's demise.
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