It is predicted that the sun may explode, but not for millions of years. We have seen that other stars that are similar to our sun have a common life history. As the sun gets older, it will run out of hydrogen and helium to burn. It will eventually grow much larger, so that the surface of the sun will be as close to Earth as it is currently to Mercury. This phase of stellar evolution is called a 'red giant'. The earth will be very hot then, and there will be no liquid water left. No humans could survive on earth through the red-giant phase. In the very end, the sun might explode, but there won't be any humans left on earth then to see it. However, there are two things to think about - will all humans be confined to Earth in one million years, and will there still be
humans in one million years, or will humans evolve into a new species?

If the sun exploded, the probability of anything in the solar system surviving would be just about zero.Fortunately, there is no reason to believe that the sun will ever explode. More worrysome is that in about 5 billion years the sun will run out of hydrogen fuel. When that happens, the sun will enter the red giant stage and become
very large and luminous. This will cause all sorts of problems, especially if the sun becomes bigger in radius than the earth's orbit.

Even if the Earth somehow miraculously survived such an explosion, we could not survive the aftermath. Almost all of the energy which allows things to happen on Earth can ultimately be traced back to the Sun. If there were no Sun, the Earth would be much too cold for most life to survive. There would be no rain or weather, and all the water would freeze. All of the plants would die, so there would be no food and no source of oxygen.