Why can't humans live on other planets?

It is impossible in these 50 years.

First of all, only the earth in the entire solar system has an environment suitable for human survival. Other planets (such as Mars and Titan) must be modified before they can barely support human life. However, the plan to transform the planet is still a theory. Even if it is implemented immediately, it will not take more than 100 years to establish a complete ecosystem.

If we want to enter alien planets in the short term, we can only seek outside the solar system, but we need to overcome the distance problem. It would take decades at best for current spacecraft to fly out of the solar system. After all, human beings have a limited lifespan, and they will not be able to reach other galaxies hundreds of light years away to find settlements.

Some people will say that refrigeration technology can be used to stop human metabolism and thaw it after reaching the destination. This theory is very attractive, but today’s technology can only freeze and preserve corpses, and living bodies cannot be frozen and thawed normally. Survive.

In addition to the longevity issue, there is also a fuel supply issue. The spacecraft cannot take off with too much fuel, otherwise it will not be able to fly. Before flying out of the solar system, the fuel on the ship has been exhausted, and future speed can only be accelerated and replenished by the forces between passing planets. After leaving the solar system, there is no star that can provide power between it and other galaxies. Even if the solar sail in the experiment is used, it is too far away from the energy source to reach it.

There is also a hellish rubble belt surrounding the solar system. It is very doubtful whether the ship's hull can advance through this space without damage.

There is also a view that the space-time folding method of black holes can be used to make space jumps for spacecrafts to quickly reach other galaxies. However, so far, we are limited to theoretical dialectics on what black holes are. Some astronomers even deny the existence of black holes at all. . If black holes really exist and existing physical laws are invalid for them, it will take a lot of time to understand and explore.

So now, our dream of entering the interstellar world is just a dream, and it may not even be realized in the lifetime of this generation.