1. How do astronauts sleep in weightlessness? Astronauts float in sleeping bags and hang people upside down on walls, corners, ceilings and so on. With ropes, there is no feeling on their backs and sides.

2. The flight cabin that astronauts take when they take off is (return cabin).

3. The first rocket research institution in China, the Fifth Research Institute of the International Department, was headed by (Qian Xuesen).

The first satellite in the world was launched by the former Soviet Union, thus opening a new era of human spaceflight.

The first astronaut who successfully went into space was (yuri gagarin), who came from the former Soviet Union.

The first astronaut to land on the moon was (Armstrong), and he was (American). He first realized the ideal of man landing on the moon.

7. On its first flight, the first manned spacecraft circled the earth (once) and flew in space (108 minutes).

China's Shenzhou experimental spacecraft was launched by a carrier rocket (Long March II F).

9. The propellants used in the third stage of the Long March 3A carrier rocket are (liquid hydrogen and liquid oxygen).

China launched a long-range rocket into the Pacific Ocean in (1980).