Interstellar migration travel

This so-called super earth is 3 1 light-year, actually on August 2, 20 19. The national aeronautics and space administration (NASA) announced that its transit exoplanet survey satellite TESS had discovered a potentially livable planet: GJ357d.

If the news is reliable, this planet will be the closest planet to the solar system discovered by human beings so far.

However, from the data we have seen so far, I don't think we should be too optimistic. First of all, although this planet is just within the livable zone from the star. But we should also know that the mass of this planet is 6. 1 times that of the earth, that is to say, it is a question whether human beings can stand up on this planet.

Secondly, we don't know whether this planet is made of rocks.

Also, through calculation and measurement, we can know that the radiation intensity received by this planet is similar to that of Mars, which means that if there is no atmosphere, the temperature of this planet will be lower than 53 degrees at night.

Therefore, the ultimate survival of a planet depends mainly on the following aspects:

Stable star's suitable position (in galaxies and star systems), atmosphere (resisting cosmic rays and maintaining temperature), geomagnetic field (resisting stellar wind), suitable climate (tilting its rotation axis and being towed by large satellites), large planet protection (reducing the impact of meteorites), and suitable liquid water gravity.

How to get to GJ357d

Assuming that these conditions can be confirmed, GJ357d is a particularly livable planet, and it just happens to catch up with the end of the earth. If human beings want to find a planetary immigrant, the goal is GJ357d. So how do we operate?

In fact, it is impossible to achieve with the current level of science and technology. Our fastest aircraft can't reach 30 km/s now, and GJ357d is 3 1 light-year away, and the whole distance is about 2.932 *10/4 km. If we do a simple unless operation, it is 9.8 * 10 12 seconds, which is 1.65438.

The acceleration time and the use of gravity slingshots are not considered here, and the fuel problem is not considered. It should be said that this is completely impossible.

Is there any way? I thought of two, both of which are more sci-fi, but at least one may not be found, and the other may not be found unless there is evidence to prove its existence.

Only send embryos or genetic maps.

If we want to send humans there, it is actually too troublesome, too heavy and too long a journey, and it is almost unrealistic to get there. Therefore, we can only compress it as much as possible. The first is to give people compression. To put it bluntly, it is DNA sequence, which is actually the orderly arrangement of atoms. Therefore, people don't have to go, as long as DNA sequencing can go. Therefore, this is actually a problem that can be solved by moving hard disks and 3D printers.

Therefore, if we look at the current technology, we can only send a robot, human data or frozen embryos to GJ357d, so that the journey does not need any food supply, all the assembly can be used to store fuel, and the robot does not need to be started, which can further save energy, and because most parts of the universe are almost vacuum (of course, there is no pure vacuum, just approximate. Therefore, you can install a solar energy absorption board to absorb solar energy and store it in the battery. Before leaving the solar system, we can make full use of the gravitational slingshot effect, which can greatly improve the speed.

According to the current experience, if an aircraft wants to fly away from the solar system, the speed can reach above 20km/s after several gravitational slingshot effect. Voyager 1 and Voyager 2 used this method.

Then when you get there, you can use local materials (atoms) to train people.

wormhole

In addition to the above methods, there is actually another method that has not yet landed, and that is the wormhole. There is no evidence to prove the existence of wormholes. In fact, wormholes have long been proposed, among which Einstein played an important role. Therefore, the wormhole is also called Einstein Rosen Bridge. Through the wormhole, we can go to very distant places, and it only takes a little time.

At present, the mainstream views on wormholes are as follows:

Wormholes exist in the quantum world, which appear and disappear very quickly and are extremely small. If you want to open a wormhole for crossing, you need to inject something called negative energy into the wormhole. But what we know is that tidal force in the wormhole is very big, so in order not to be torn by tidal force.

How much do you want to pour?

Scientists found through calculation that opening the wormhole to 1 light-year requires at least six times the total negative energy, and this width can ensure that the spacecraft will not be torn apart by tidal force. Therefore, it seems very sci-fi and almost impossible to accomplish this task through wormholes.

So I think the life span of the sun as the main sequence star is more than 5 billion years, and the time when the earth is in the livable zone is still 2 billion years. In other words, humans can still live on the earth for 2 billion years, so don't always think about interstellar immigration. After all, it is hard to say whether human beings can survive 2 billion years, even 200 million years or 20 million years, because the whole history of civilization is only 6000 years.