Eternal interstellar migration

The sun is a yellow dwarf, which has been burning for about 4.6 billion to 5 billion years, and it may take another 5 billion years to become a red giant.

What is a red superstar? In short: old star. A short period of instability at the end of a star, only a few million years. Red giant stars have several obvious characteristics. First, the fusion reaction of the red giant star is sharply reduced due to the reduction of its core hydrogen, its surface temperature will become lower, the visible light emitted will appear red, and its volume will expand hundreds of times, about 200 times.

What happens when the sun expands 200 times? Will engulf our earth. Maybe you will say that this day is still far away from us, and human beings may not live to experience this amazing change in the solar system after 5 billion years. I agree with you very much.

I have read many reports that Andromeda has been in contact with the periphery of the Milky Way. After about 3 billion years, it will usher in a century-long collision between galaxies and merge into a larger and more complex galaxy. We are completely uncertain whether the earth or even the solar system can escape this disaster. Maybe you will say that 3 billion years is still far away from us. At that time, humans may have invented spaceships approaching the speed of light, looking for new homes in the universe. If so, of course, it is best.

In any case, the earth and even the sun will eventually be doomed. Let's see what other way we can live then.

1. Build a huge and efficient spaceship.

Interstellar immigrants need stable and reliable means of transportation, and it is essential to build such a large spacecraft. The key difficulty is the kinetic energy and speed of the spacecraft. At present, the feasible kinetic energy includes: hydrogen energy, nuclear energy, solar energy, cosmic rays and so on. A single energy source is not enough to cope with the sudden crisis in the universe during interstellar travel, and a multi-energy system can adapt to complex interstellar flight.

Probably only nuclear energy is sustainable and stable, and other forms of energy will face problems such as refueling. For example, cosmic ray energy needs to invent a set of equipment to capture the process of transforming cosmic rays into kinetic energy.

As for the speed of the spacecraft, we know that gravity will cause space-time bending, except for wormholes found in places where space is folded and space-time bending is particularly serious. Another element, according to scientists' speculation, may change the gravity of the spacecraft and realize light-like flight, which is the element terbium. But all this has yet to be confirmed and cracked by scientists.

In addition, hundreds of millions of years of interstellar flight cannot be wasted. In this huge time, we are enough to form a more advanced civilization inside the spacecraft, which may shake the original view. Is it necessary to continue looking for the next earth to reproduce?

2. Develop intelligent robots, carry genetic embryos of the earth and sail in cross star.

First of all, I have to admit that this idea is bold and risky, but it may be the only way in the future, because human beings don't have that long life span and can sail in the vast universe for hundreds of millions of years. Humans collectively entered the dormancy room to sleep, and countless embryos were frozen in liquid nitrogen. It is necessary to improve the freezing technology to ensure the activity of samples during long-term freezing, so that they can be revived and cultured when they arrive at their destination.

Key question: robot debate.

The focus of all the arguments is the fear that robots may become enemies of human beings and endanger human beings. This is really a very dangerous bet. I don't have an answer, but if it is really possible for a robot to have self-awareness, I think the choice is still in its own hands.

To some extent, mechanical life can be said to be eternal and can last for a long time, but whether it will sincerely carry out human instructions is indeed full of danger and uncertainty, and only time will tell!

3. Advanced civilization, the establishment of Dyson circle.

This can be said to be more difficult than looking for wormholes in the universe. The sun accounts for 99% of the total mass of the solar system, and the sum of other substances in the solar system is less than 1%. It is difficult to wrap 99% of the sun with 1% substance, but if one day humans fly out of the solar system, they can still try to wrap the sun with substances outside the solar system.

Well, if you like this article, please comment. )