Scientists have conducted a lot of researches and study to estimate that the Sun is not going to explode for another 5 to 7 billion years. When the Sun does cease to exist, it will first expand in size and use up all the hydrogen present at its core, and then eventually shrink down and become a dying star.

Can the Sun explode at any moment?

The Sun won't explode. Some stars do explode at the end of their lives, an explosion that outshines all the other stars in their galaxy added together - something we call a “supernova”. ... Our star will swell up, becoming something called a “Red Giant” star. It might even get so big that it swallows the Earth whole.

What year will the Sun die?

Eventually, the fuel of the sun - hydrogen - will run out. When this happens, the sun will begin to die. But don't worry, this should not happen for about 5 billion years. After the hydrogen runs out, there will be a period of 2-3 billion years whereby the sun will go through the phases of star death.