2. When the spacecraft's automatic system loses its function, the astronauts need to return to the ground successfully through manual operation. Astronauts can clearly understand the information fed back by various instruments on the spacecraft, make accurate judgments on the information and make correct responses at the same time.
3. When the contact between the spacecraft and the ground is affected, the astronauts can complete the task alone and operate the spacecraft independently to return to the ground. Astronauts can actively participate in some transformation of the spacecraft, which can make the spacecraft more reasonable and more comfortable to drive.
Astronaut type:
Because the tasks of manned space activities are more and more diversified, astronauts are divided into two categories:
One is a space pilot, whose main task is to drive a manned spacecraft. Such astronauts are generally selected from experienced air force pilots.
The other is scientific and technical personnel, who perform various space missions, such as launching satellites in orbit or recovering and repairing satellites from orbit, conducting space physical exploration, space medical research and space processing experiments. This kind of astronaut does not require flying skills and experience, but must have some kind of scientific and technological expertise.