When will humans build all kinds of starships in science fiction movies?

A: Humans are currently in the exploration period of the space age. Interstellar navigation needs many advanced technologies to make a breakthrough, which can be realized in hundreds of years, and it takes thousands of years.

It took more than 65,438+000 years for mankind from the invention of the steam engine to the appearance of the automobile, 65,438+000 years for mankind from the appearance of the airplane, and more than 50 years for mankind to enter space. The next step is to land on another planet to establish a permanent base, and then realize interstellar navigation and fly out of the solar system.

With the current technical level of mankind, it is no problem to build a large spaceship, but the cost is too high; Moreover, the current space thrusters all use chemical fuels, making it difficult to achieve long-distance space navigation.

In order to realize interstellar navigation, human beings must first solve two major problems, one is efficient propeller, and the other is energy supply.

Propeller chemical thrusters rely on chemicals to release a lot of energy to propel spacecraft, but chemical combustion requires a huge amount of fuel and oxidant, which greatly increases the weight of spacecraft; For example, Apollo series spacecraft carry more than half of the total weight of fuel.

It is possible to realize plasma thrusters and solar wind thrusters in the future. The plasma thruster first converts matter into plasma, and then ejects it at high speed, thus pushing the spacecraft forward. Solar wind thrusters need to be used near stars.

The energy supply of chemical fuel can help us leave the earth, but it is far from enough to realize interstellar navigation. At present, all countries in the world are vigorously developing controlled nuclear fusion technology. Once it is realized, the energy problem of mankind will be completely solved.

Then, controlled nuclear fusion technology is improved and installed on the spacecraft, which can meet the needs of a spacecraft's long-distance interstellar navigation, and even allow human beings to walk out of the solar system and realize interstellar migration.

But at present, propulsion technology and energy technology can not be solved in a short time, and interstellar navigation needs far more than these two technologies; Perhaps human interstellar travel will be realized in the next few hundred years, and it will take thousands of years to be slow.