眾所周知，太空中並無氧氣存在，然而太陽卻能持續“燃燒”。令人驚奇的是，這種“燃燒”的劇烈程度和持久性，遠超地球上任何一種燃燒現象，已經持續了46億年。
First, we need to understand the nature of combustion. Combustion is a chemical reaction that produces heat and emits light, and its reaction process is extremely complex. Combustion requires the presence of three necessary conditions at the same time: combustibles, oxygen, and the minimum temperature required for combustion.
During combustion, momentum, heat and mass are transferred between fuel, oxygen and combustion products.
However, despite the fact that burning is common on Earth, there is no oxygen in space, so how does the sun "burn"?
事實上，太陽的“燃燒”與我們常見的燃燒有所不同。太陽的“燃燒”是通過核聚變反應來實現的。在太陽的核心，溫度高達1500萬攝氏度，壓力也極其巨大，大氣壓高達2500億個。在這樣的極端條件下，氫原子核會相互碰撞，融合成更重的氦原子核，並釋放出巨大的能量。
Miraculously, this "burning" of the sun does not require the participation of oxygen in the whole process.
So, how does the sun's nuclear fusion continue? This is thanks to the tremendous mass of the sun. The mass of the Sun is so large that its gravitational pull is strong enough to compress the material in the core region to extremely high densities and temperatures, thus maintaining the nuclear fusion reaction.
Therefore, even in the absence of oxygen in space, the sun can still continue to "burn" steadily, illuminating our universe and providing a steady stream of light and heat for all living beings on earth.
Theoretically, the "combustion" of the sun is not part of what we usually define as a chemical combustion reaction, because it does not require the participation of oxygen.
Of course, we can also understand it from another angle, that is, the sun is not burning, it just looks a lot like a burning fireball, nothing more.
In fact, in the universe, with the exception of stars like the Sun, collisions between celestial bodies are also like combustion, but they are not actually combustion.
For example, the comet collision event in 1994 years looked very spectacular, and the moment Comet Smy Klevy 9 collided with Jupiter, a huge "flame" was produced. And this "flame" is not a burning flame, but a large amount of thermal radiation released by the impact.
儘管太陽已經“燃燒”了46億年，但它還將會繼續“燃燒”五六十億年，直到它內部的氫元素消耗殆盡，它將會變成紅巨星併發生膨脹，最後成為一顆冷寂的白矮星。