Here's why:
* The Sun's expansion: While the Sun will expand significantly during its red giant phase, it won't reach as far as Mars's orbit. The outer edge of the Sun will likely extend to somewhere between the orbits of Earth and Mars.
* Mars's current orbit: Mars is about 1.5 times farther from the Sun than Earth. This means it will be safely outside the Sun's expanding atmosphere.
However, Mars will experience significant changes:
* Increased solar radiation: The Sun's intense radiation will likely strip away Mars's atmosphere, making it even more inhospitable than it is now.
* Possible changes in Mars's orbit: The Sun's expansion and gravitational pull could potentially alter Mars's orbit, causing it to become more elliptical or even unstable.
Overall, while Mars won't be engulfed, it will experience dramatic changes due to the Sun's red giant phase. These changes will likely make the planet even less hospitable for life.
