6. Infer At what stage in the life cycle of the Sun will it be impossible for life to exist on Earth?Explain __

Life on Earth will become impossible during the Sun's **Red Giant** phase.Here's the explanation:As the Sun ages, it will eventually exhaust the hydrogen fuel in its core. This will cause the core to contract and heat up, while the outer layers of the Sun will expand dramatically. This expansion marks the beginning of the Red Giant phase.During this phase, the Sun's radius will swell to encompass the orbits of Mercury, Venus, and possibly even Earth. Even if Earth isn't directly engulfed, the increased solar radiation and proximity to the intensely hot Sun will boil away Earth's oceans and create a scorching, uninhabitable surface temperature. The intense heat will make it impossible for any known life forms to survive.