In fact, the Sun is doing a slow-motion explosion. It is shedding about 600 million tons every second in light energy, and it is loosing about 100 trillionth of its mass every year in the so-called solar wind. Here is a satellite photo of one of these mass ejections seen by the NASA/ESA SOHO satellite on December 2, 2003. These are dramatic events and often eject ‘a billion tons’ of plasma every few weeks or months. As impressive as they are, the sun is far more massive by a factor of a billion-billion times (1018).
But the sun will never blow up the way we think of a genuine explosion. It is the wrong kind of star to be either a nova or a supernova. It has no companion star for mass-transfer, and its mass is well below the 6-8 solar-mass limit when supernova detonations start to occur.
The energy of the Sun, the thermonuclear fusion which produces all the heat and light, is occurring in the core of the Sun. The weight of all the mass in the Sun in the overlying layers is so enormous that the Sun is in an equilibrium state where the internal thermal pressure is balanced by the gravitational pressure directed inwards.
Eventually, this balance will cease as the core depletes its hydrogen fuel. The core will collapse and heat up causing the outer layers to expand as a planetary nebula like the one shown here: NGC 6720 (Credit:ESA). This is still not a detonation that shatters the sun into interstellar space. In fact, more than 90% of its mass is left behind as a white dwarf ,which is a stable configuration of matter.