What if the sun disappears? Expert: there are two stars to replace!

In a few years, if the life of the sun is over, what will happen in the end?


As time goes on, all the stars in the universe will no longer shine. Countless huge, hot planets are consuming hydrogen fuel, and it will be a long time before a new generation of stars will appear. Eventually, the free hydrogen in the universe will be exhausted. The last survivors are red dwarfs, stars with lower surface temperatures and brightness, and the most common stars. The amazing thing about them is that they can live as long as 20 trillion years, 4000 times longer than the sun. All the planets orbiting red dwarfs (many are known to date) have light and heat that can keep some kind of life alive for a long time.

Special effects of red dwarf


But even red dwarfs die. In 100 trillion years, the last generation of hydrogen burning planets will be born in the remaining gas cloud. By 200 trillion A.D., even the last stars will be extinct. From then on,


The universe will be dark, incredibly cold.

If any life really survives, they will have to face a very difficult situation.


Now, we have entered a period of unpredictable modern human knowledge, which is a completely unfamiliar field.


It is worth mentioning that we are still unable to predict the ultimate fate of the universe.

In the past, we thought that there was enough matter (including dark matter) and energy in the universe, and their combined gravity could slow down the expansion of the universe, and eventually bring all the stars together again and have another big bang. It’s called the big squeeze. In fact, there doesn’t seem to be that much matter in the universe that can be squeezed.


In 1999, physicist Robert Caldwell pointed out that one day, the dark energy that drives the expansion of the universe will become stronger. According to his calculation, the stronger dark energy is called phantom energy, and its power can tear the whole universe into atoms; this is the so-called “big tear”, which may occur in 20 billion years later.


There is also a relatively conservative view that large tears and large compressions may not occur. There is one drawback to this assumption

The future universe will be gloomy and uninteresting to an incredible degree.


Professor Martin Reese, the Royal astronomer, said: “if the acceleration of the universe continues The universe we can observe will become more empty and lonely. Those galaxies that are already far away will not only get farther and farther away, but also flee faster and even disappear completely from each other’s view. “

At that time, the whole universe will be dominated by more strange and darker stars. Among them are brown dwarfs and independent Jupiter sized planets, which are not hot enough to become stars. The heat inside them can keep human civilization going for another billion years. In addition, there are some extinct white dwarf debris, some “degenerate” behemoths, black holes and neutron stars. In space larger than the Milky way, the brightest material will glow with the energy of a 40 Watt light bulb. (the manufacturer of sunglasses may go out of business)

The remnants of stars and planets will become the only source of energy, and the core protons will begin to decay, releasing weak energy, which will be the last warning line on the road to eternity. Heat death became the final winner. When the life of the universe comes to an end, what is waiting there is not a breathtaking explosion, but a low whimper 10 ^ 101 years later.

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