Human beings are indeed a kind of forward-looking wisdom. When the sun is in its prime, it has been considering what human beings should do if the sun dies.
The sun will not last forever. Five billion years later, it will grow old, no longer have the ability to serve mankind, and will do harm to the earth. Why? This starts with the nuclear fusion reaction inside the sun.
The reason why the sun can emit light and heat is because of the nuclear fusion reaction inside it - the fusion of hydrogen atoms into helium atoms and the release of energy at the same time. Now half of the hydrogen atom in its center has become helium, so when the hydrogen is exhausted, the sun enters the old age of its life.
At this time, instead of rapidly cooling down, it heated up and expanded hundreds of times, and turned into a hot red giant. This will burn nearby planets to ashes. Finally, there was a complete explosion and became a white dwarf. It will be a terrible scene for mankind. So when disaster happens, what should mankind do?
Scenario 1: one kind of migration is that humans move to closer planets, such as Ganymede 3 and Ganymede 4. Their original ice will be melted and humans may transform it into a habitable place. However, this method can not achieve full migration;
Scenario 2: another way to move is to "escape" the earth. By "evaporating" 10% of the water in the ocean and reducing the mass, the earth can leave its orbit and go to the orbit of Saturn, so as to stay away from the damage of the sun. One idea is to "heal" the sun, make the hydrogen fuel between its core and surface flow to the core area, and remove the helium waste from the core, so that the sun can live safely for another 10 billion to 100 billion years. However, the realization of this assumption is very difficult.
Scenario 3: to create an artificial small sun. At present, we can only start with thermonuclear reaction to slow down the rate of nuclear combustion. It's hard to control.
Five billion years is still a long time, enough for mankind to come up with a panacea to protect life on earth.