How do ordinary people go into space by manned spacecraft? Can you come back alive?

China's space technology has always been famous for its rigor, and its launch success rate is among the best in the world. Being an astronaut in China is obviously not easy, because the competition is fierce. Of course, it is based on the outstanding pilots of the current Air Force, and future scientists will definitely appear in front of us.

Astronauts are geologists and biologists. Geologists must be one of the astronauts who landed on Mars. In the development of manned space flight in China, the first batch must be pilots, because their task is to explore and establish a mature operating mechanism, and then they will become scientists.

Under the existing theory, an object without static mass can reach or even exceed the speed of light, so no matter how much energy you have, you can only fly at an infinitely close speed to the speed of light. Well, if you have such a spaceship and fly to the sea of stars, you don't have to worry about life, because as long as the speed of your spaceship is close enough to the speed of light, according to the relativistic effect, you will have enough time to fly to the end of time (if time has an end). Let me talk about the second point, which is crucial. This is our universe. There are three alternative answers: 1. If the universe is straight, then space is an infinite plane with at most some folds. If the universe is open, then space will be an infinite saddle. The universe is spherical, so our space is limited. If this space is small enough, even smaller than Hubble, then in this case, the galaxy we see tens of billions of light years away is probably the light of the same galaxy, which has circled the universe several times.

When the human spacecraft reaches the first cosmic speed of 7.9 kilometers per second, it will make a circular motion around the earth orbit; When it reaches the second cosmic speed of11.2km per second, it escapes from the gravity of the earth and orbits the sun. When the speed continues to rise above third cosmic velocity 16.7 km/s, the spacecraft will fly out of the solar system without the constraint of solar gravity, and then start to leave the Milky Way when it rises to the fourth cosmic speed 120 km/s, and then it will be over.

The spacecraft always moves in a circle under the action of gravity, but when it reaches the minimum value of each space speed, it will break away from its constraints. According to the topic, the spaceship seems to have been flying forward. In fact, the spaceship moves in a circle around a central point. As long as the speed reaches the minimum initial speed of the center of the universe, it will fly farther. In short, it will always fly outward and never return to earth!