On September 9, according to foreign media reports, on Wednesday local time, SpaceX and NASA announced that the two sides have scheduled to launch the fourth batch of commercial astronauts (crew-4) to the international space station on April 15, 2022. If the plan goes well, SpaceX will launch a manned dragon spacecraft from NASA's Kennedy Space Center on the same day with a Falcon 9 rocket < p > < / P > < p > figure: on April 23, 2021, at NASA's Kennedy Space Center, the SpaceX Falcon 9 rocket is ready to send astronauts carrying four crew members into space on NASA crew-2 mission < / P > < p > the four astronauts on this mission are NASA astronauts Kjell Lindgren (Commander) and Robert Hines (pilot) European Space Agency astronaut Samantha cristoforetti (mission expert), the identity of the fourth astronaut has not been disclosed. After the handover with crew-4 astronauts, crew-3 astronauts will return to earth in late April 2022 < p > as the name suggests, crew-4 will be SpaceX's fourth commercial crew program manned mission for NASA. In the past few months, SpaceX has completed two manned missions: crew-1 was launched in November 2020 and returned to Earth last May. Crew-2 was launched in April this year and is scheduled to end in early November. SpaceX and NASA plan to launch crew-3 on October 31 < p > previously, SpaceX sent two NASA astronauts to the space station in May 2020. However, the two-month test mission, called demo-2, is SpaceX's first manned space flight. Its success paves the way for NASA astronauts to enter space regularly < p > before launching crew-3, SpaceX will carry out its first purely commercial manned launch mission, inspiration4, on September 15, bringing billionaire Jared Isaacman and his three companions, Hayley Arceneaux, Sian Proctor and Christopher sembroski The manned dragon spacecraft was put into orbit. The spacecraft will orbit the earth for three days and then return to the Atlantic for parachute assisted splashdown < p > NASA's "commercial astronaut program" is providing safe, reliable and affordable shuttle services between the earth and the international space station through public-private cooperation, which will allow astronauts to have more research time and increase the opportunities for discovery on human orbital outposts. The international space station remains a springboard for space exploration, including future missions to the moon and Mars. (small) < / P > < p >