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Stars emit light and heat by fusing lighter elements into heavier ones. All kinds of nuclear fusion reactions take place in stars all the time, the most important of which is the reaction of hydrogen fusion to helium

in stars with different mass, the reaction path of hydrogen fusion to helium is also different. In smaller stars, the fusion reaction of hydrogen nuclei takes place through proton proton chain reaction. The process is shown in the figure below

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whether it is to split the iron core (fission), or to continue to increase the weight of the iron core (fusion), we need to increase the energy of the iron core. Inside a star, however, there's not enough energy. In this way, the energy generation of the star will stop, and the radiation pressure used to resist gravity will disappear. The star will continue to contract, and the speed of contraction will be faster and faster. Finally, the speed of external matter falling to the iron dominated stellar core will exceed 100000 km / s, but when it reaches the iron core, it will hit an extremely hard "wall", and the speed will instantly drop to zero. The huge kinetic energy will be instantly converted into heat energy, heating the iron core to billions of degrees. The outer layer of the iron core will explode at a very high temperature, exploding the falling material in the outer layer. This process is called "core catastrophe". This is a supernova explosion

at the same time of explosion, under the action of huge energy, a part of iron in the outer layer of iron core will absorb energy and form elements heavier than iron, from 27 element cobalt to 92 element uranium. The iron inside the iron core will press the electrons outside the iron nucleus into the nucleus under the pressure of implosion, and combine with the protons in the nucleus to proce neutrons. All the iron inside is converted into neutrons. When the outer shell is blasted and dissipated into space, the center of the star is exposed and becomes a neutron star with huge mass and small scale

after the stellar matter from hydrogen to uranium dissipates into space, it will mix with the original interstellar matter in space to form interstellar cloud, and form new stars and planets around stars under the gravitational disturbance. This is how our sun and earth came into being. That's how everything on earth except hydrogen and helium comes from

we are all the ashes of a supernova that erupted billions of years ago

as long as there is enough capital and cheap electricity, as well as computers with superior performance, the payback cycle is very short. Moreover, if you are a believer in bitcoin and want to collect money, mining is undoubtedly more cost-effective than speculation. Take the latest miner on the market, ant miner S19 Pro 110t, for example. The market price is about 20000 yuan, the calculation power is 110th, the total power is 3250w, the electricity charge is 0.3 yuan / kWh, the daily output is 0.000924 bitcoins, the income is about 59.27 yuan, and the electricity charge is 23.4 yuan, the daily net income is 35.87 yuan. If the price is in equilibrium, the payback cycle is about one year and seven months