Two hundred words on Wandering Planet.

2 1 century, astrophysicists found that the sun would produce a violent explosion called helium flash.

About three-quarters of the mass of the sun is hydrogen, and most of the rest is helium. The sun's light and heat come from the uninterrupted nuclear fusion of internal hydrogen. When the hydrogen is exhausted, the high temperature and high pressure inside the sun will stimulate the fusion of helium in a short time, and a huge amount of helium will be excited in such a short time. Helium flash will happen and release a heat wave enough to destroy the earth.

After the explosion, the sun will become bigger, big enough to touch the earth's orbit and devour the earth.

But don't wait for the sun to expand and devour the earth, because after about 100 hours of helium flash, the earth will completely vaporize.

When helium flash happens, everything on the earth's surface will evaporate instantly, and people on the ground will disappear like bubbles.

2. escape plan

Humans facing extinction will naturally not choose to wait for death. In the original work, people put forward two completely different escape schemes:

First, the spaceship plan is to build a spaceship with a miniature biosphere, abandon the earth and rush to the universe; The second is the wandering earth scheme, which builds a planetary engine on the surface of the earth, so that the earth and human beings can run to Xinghai together. In the original work, even because of the differences in the scheme, there are two factions within mankind: the spaceship faction who advocates the spaceship scheme and the earth faction who advocates the wandering earth scheme by the Coalition government. Factional struggles continue, from daily struggles among children to riots against the Coalition government.

But in the end, the wandering earth scheme won-because the spacecraft was cheaper and more flexible, but its size was too small. The largest spacecraft can only reach "the size of Shanghai or new york", and the ecological circle with insufficient volume cannot support human beings to complete the navigation plan. Although the earth is "heavy", human beings can directly use the ecological circle of the earth itself to survive.

Moreover, compared with the earth, the spacecraft is so fragile that it is in danger of being damaged at any time in the unpredictable space.

3. Gravity slingshot effect

To push the earth out of the solar system, the first task is to get rid of the sun's gravity. The planetary engine built by human beings can provide the earth with extremely limited speed. In order to get fast enough to get rid of the sun's gravitational bondage, human beings must use the gravitational slingshot effect to accelerate the earth.

The principle of gravity slingshot is to accelerate the aircraft through planetary gravity. Imagine a skier A rushing to another opposite skier B at an oblique angle. When they meet, B pulls A to make him swing horizontally for half a circle, and A will get higher speed when they are apart.

The schematic diagram of Voyager 2 using gravitational slingshot effect to accelerate.

If the earth wants to get rid of the gravitational bondage of the solar system, it needs to be accelerated by 15 times with the help of the solar gravity. Until the acceleration of 15 was completed, the earth was thrown to Jupiter by the sun, and finally accelerated to escape from the solar system with the help of Jupiter's gravity. This also explains why the earth is captured by Jupiter's gravity in the film.

The acceleration of the earth around the sun is just like the acceleration of Chang 'e satellite around the earth.

4. Wandering Earth Project