* Current Size: The Sun's current radius is about 695,000 kilometers.
* Red Giant Size: When the Sun enters the red giant phase, it will expand to roughly 100 to 200 times its current size. This means its radius could reach 69.5 to 139 million kilometers.
To put this into perspective:
* Earth's Orbit: The Sun's red giant phase will engulf Mercury, Venus, and likely Earth. Mars might survive, but its surface would become uninhabitable.
* Size Compared to Earth: At its largest, the Sun will be approximately 100 times the diameter of Earth.
Important Notes:
* Expansion Time: The Sun won't become a red giant for another 5 billion years.
* Red Giant Stage: The Sun will remain in its red giant phase for about a billion years before eventually becoming a white dwarf.
* Evolutionary Process: The expansion of the Sun is due to the fusion of helium in its core. This causes the outer layers of the Sun to swell and cool, giving it a red appearance.
So, while the Sun's red giant phase is still a long way off, it will be a dramatic and awe-inspiring event in the history of our solar system.
