# Is ” Wandering Earth” Reliable?

As the first domestic sci-fi blockbuster, ” Wandering Earth” went from inside the cinema to outside the cinema.

Some people pay homage to it, saying that it has taken domestic sci-fi movies to a new height. There are also people who ” get into the play too deeply”, which is quite true to the scientific setting in the movie.

Since everyone is so keen on the scientific plot, we might as well find scientists to popularize science. I believe it will be interesting to understand them and review the movie.

Wandering is not a walk-on trip.

The most earth-shattering imagination in Wandering Earth is to use tens of thousands of planetary engines to help the Earth leave the solar system. This requires us to say how much energy is needed to get the earth out of the solar system.

” The energy needed to get rid of the gravitational potential energy of the sun when the earth moves around the sun and leaves the solar system can be calculated, which is about 2.65× 1033 joules.” Zhou Liyong, professor of the School of Astronomy and Space Science of Nanjing University, analyzed.

At present, the energy produced by human beings can be estimated by global power generation. According to statistics, the world’s total power generation in 2017 is about 25571 TWh, or about 9.21 x 10.19 joules.

” That is to say, if all the electricity generated in the world at this stage is used to push the earth away from the sun, it will take 2.88× 1013 years of continuous work, that is, nearly 29 trillion years. The age of the universe is about 13 billion years. ” Zhou Liyong said.

In short, taking the earth to wander is not a walk-on trip. If the planetary engine is to undertake this task, it must be extremely powerful.

Heavy nuclear fusion is only science fiction at present.

In Wandering Earth, the planetary engine achieved the above tasks by means of heavy nuclear fusion technology.

Meng Daqiao, a researcher at the China Institute of Engineering Physics, told ScienceDaily that nuclear fusion refers to the reaction of two light nuclides to form a nuclide with heavier mass element. The heavy nucleus can only split into two nuclides lighter than the parent nucleus. For example, uranium – 235 will become an element with a mass of 95 – 105 after fission.

” Judging from the knowledge of modern nuclear physics, elements above number 90 have a fission trend, and elements below number 10 have a fusion trend. At present, there is no theory or conditions for heavy nuclear fusion. ” Meng Daqiao said.

It seems that such planetary engines can only appear in science fiction at present.

The ending of ” Wandering Earth” is very thrilling and exciting: seeing the earth getting closer and closer to Jupiter, the situation is extremely critical. Astronaut Liu Peiqiang drove the space station carrying fuel and ignited the hydrogen vortex on Jupiter.

In response, Zhang Shuangnan, a researcher at the Institute of High Energy Physics of the Chinese Academy of Sciences, said he had a better way to ignite Jupiter: for example, Jupiter can be ignited with a high-power laser, after all, nuclear fusion reactions need to be ignited with a high-power laser.

” In theory, it is possible, but only if the power is strong enough.” Meng Daqiao said that according to this idea, Jupiter will ignite faster, but the degree of adventure will be less.