How long will the sun last?

 How long will the sun last?

The Sun is currently in the middle of its life, and has been burning for about 4.5 billion years. It still has about 5 billion years of fuel left before it runs out.

At that point, the Sun will run out of hydrogen fuel in its core, and the core will begin to contract. This contraction will cause the temperature to increase, which will cause the outer layers of the Sun to expand and become cooler. This process will cause the Sun to become a red giant.

The sun will expand to hundreds of times its current size, engulfing the inner planets, including Earth. After this phase, the sun will shed most of its outer layers and will shrink to become a dense and hot white dwarf.

It's important to note that the above timeline will only happen if the sun follows the most common path for a star of its mass. The sun's final fate could be more complex, and this could be affected by many factors such as galactic collision and other astronomical events.