La muerte del Sol

Stars, including our Sun, have a finite lifespan. They are born, develop, and eventually die. As stars like the Sun age, they expand into red giants, potentially reaching Earth's orbit. During this phase, the core contracts while the outer layers expand. Although Earth might survive this expansion, it would be lifeless due to increased heat. Eventually, the Sun will exhaust its energy, lose its atmosphere, and contract into a small, dark object. This marks the Sun's transition into a dead star, cooling over billions of years.

What will the universe look like when the sun becomes a dead star?

What will happen to the sun after it cools down and exhausts its energy?