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The notion of the Sun suddenly exploding tomorrow is an intriguing yet alarming scenario to consider. Astronomically, the Sun is classified as a G-type main-sequence star (G dwarf), predominantly composed of hydrogen and helium. Its stability is a result of nuclear fusion processes occurring at its core, where temperatures soar to approximately 15 million degrees Celsius. This balance between the force of gravity pulling inward and the outward pressure from nuclear fusion creates an equilibrium that has allowed the Sun to shine for about 4.6 billion years.

In the hypothetical event that the Sun were to explode, termed a supernova, the immediate impacts would be catastrophic. Such an explosion would be a result of the core collapsing under its own gravity, leading to a rapid expulsion of the outer layers into space at velocities exceeding 10,000 kilometers per second. This shockwave would reach Earth in just over eight minutes, the time it takes for light from the Sun to reach our planet.

The first consequences would involve extreme radiation influx. The explosion would release a tremendous amount of energy, resulting in a barrage of high-energy photons and particles that would penetrate Earth’s atmosphere. This would obliterate the ozone layer, exposing life on the surface to harmful ultraviolet radiation. The immediate air temperature would also rise astronomically, leading to potential ignition of atmospheric gases and causing widespread fires across the globe.

As the explosion progresses, gravitational effects would also play a significant role. Once the Sun’s mass, which constitutes about 99.86% of the Solar System's mass, is expelled, the gravitational pull it exerts on the planets would diminish substantially. Earth, along with other celestial bodies, would be flung off its orbit, spiraling into the cold void of space. Temperatures would plummet, transforming Earth into a frozen wasteland over time.

Moreover, the long-term implications would involve a complete shift in the Solar System's dynamics. Planets that once experienced sunlight for billions of years would now drift without a central star. The absence of solar energy would cause ecosystems to collapse, oceans to freeze, and eventually, any remaining life forms would face extinction. Over millennia, the remnants of the solar explosion would create a cloud of stellar debris, forming new celestial structures, perhaps eventually leading to the birth of new stars and planetary systems.

In conclusion, while the likelihood of the Sun exploding in our lifetime is negligible, contemplating this scenario underscores the delicate balance of cosmic forces that maintain our existence. The Sun remains a stable mainstay in our Solar System for billions of years to come, but understanding its lifecycle enhances our appreciation for the complexity and fragility of life on Earth, making us more aware of our place in the universe.