How do astronauts land on Earth

Astronauts landing on the earth can be divided into the following steps:

1. Departure from orbit: The spacecraft where the astronauts are located needs to leave orbit and enter the descent orbit. This usually requires the use of rockets or other thrusters to slow down.

2. Entering the atmosphere: When the spaceship enters the earth's atmosphere, it will be affected by air resistance and its speed will start to slow down. This will also cause the surface temperature of the spaceship to rise, and it is necessary to protect the astronauts and the spaceship through heat resistant materials.

3. Parachute: When the speed of the spaceship drops to a certain extent, the astronauts will release the parachute to slow down and descend steadily. There are usually multiple parachutes to ensure safety.

4. Landing: When the spaceship approaches the ground, astronauts will adjust the attitude and speed of the spaceship through rockets or other thrusters to ensure a safe landing. In some cases, the spacecraft can also cushion the landing impact through air cushion.

In general, astronauts landing on the earth requires coordination and control of multiple steps, and requires a high degree of technology and experience. At the same time, astronauts also need to remain calm and alert during landing to ensure safety.