How to calculate how much fuel the sun burns?

The sun, like all stars, glows and heats up through nuclear fusion.

The sun has existed for 5 billion years. According to Einstein's mass-energy formula E = MC 2, every "burning" 1 kg of hydrogen can release 6.4×10/4 joules of energy, which is equivalent to the energy generated by burning 19000 tons of coal. According to the total radiation of the sun at present, it is actually only a small part of the mass of the sun. If the mass of the sun is an integer, it is about 2×1033g, or 2×1027g. The sun converts 6× 10 8 tons of hydrogen into helium every second, and "burns" less than 2× 10 every year.

But don't worry about the impact on the earth or us at all. At this consumption rate, only 2× 10.26 tons of hydrogen is used in10 billion years, accounting for only 10% of the total mass of the sun. In the long period of 5 billion years, the sun only consumed less than 5% of its mass. On the sun, hydrogen accounts for 70% of the total elements. Although the amount of hydrogen is reduced by 20%, the stars will be in the "old state", and according to the current nuclear fusion reaction rate of the sun, the sun can "burn" stably for 3.32×10/7 seconds, about10/0 years, that is,10.

When the sun burns for more than 4.5 billion years, the hydrogen on the sun will decrease and the sun will expand. In the process of expansion, the sun will first engulf Mercury, then Venus and the Earth, until Mars is swallowed up and the sun expands to the end. But when the sun engulfs Mercury and rushes to Venus, the temperature of the earth will rise sharply and gradually evaporate all the water on the earth. All plants and animals will be destroyed by high temperature. As the sun approaches the earth, the temperature will rise to several hundred degrees to several thousand degrees. Everything that can melt will melt and everything that can evaporate will evaporate. But until the earth is swallowed up by the sun, the rest of the earth will still revolve around the center of the sun in the thin high-temperature gas in the outer layer of the sun. But we must believe that before the sun begins to expand, if human beings still exist, they will certainly find ways to deal with it, such as finding another earth and then immigrating.