Share the QR code < / P > < p > with wechat scanning code to friends and circles of friends < / P > < p > < / P > < p > on August 4. On Tuesday, local time, Boeing issued a statement confirming that the launch of the Starline spacecraft scheduled to carry out the second unmanned space test flight on the same day will be delayed due to problems found in the propulsion system. The next launch window of the Starline spacecraft is August 4, US Eastern time, but the mission team has not confirmed whether it will launch on that day < p > Boeing executives wrote in a statement: "during the preparation for the second unmanned space test flight of Starline spacecraft, Boeing engineers monitoring the health and status of the aircraft found unexpected valve position problems in the propulsion system. The problem was initially discovered during an inspection after a thunderstorm in the area where the Kennedy Space Center is located, so the launch will be postponed again. Boeing and NASA teams are evaluating the situation, and the team will provide an update on the launch attempt on August 4. " < p > John Vollmer, vice president and project manager of Boeing's "commercial astronaut" program, said in a statement: "we are disappointed with today's inspection results and will reschedule the launch time of the Starline spacecraft. Manned spaceflight is a complex, accurate and fault-tolerant work. Boeing and NASA teams will spend more time to ensure the safety and integrity of spacecraft and achieve our mission objectives. " < p > NASA also confirmed the launch delay of Starline spacecraft and its causes. "NASA, Boeing and the United Launch Alliance (ULA) have cancelled the launch attempt of the Starline spacecraft on August 3 because of unexpected problems in the spacecraft propulsion system," the agency said in a statement. Ula will begin to remove propellant from the Atlas V rocket. " NASA added that depending on whether the problem is solved, they are tentatively scheduled to launch on August 4 < p > if it can be launched on Wednesday, the Starline spacecraft will dock with the international space station on Thursday afternoon. This is not the first delay in the launch of the Starline spacecraft. On July 29 local time, the launch of the Starline spacecraft was delayed for the first time due to an accident after the docking of the Russian "science" research module with the international space station < p > during the first unmanned space test flight in December 2019, the Starline spacecraft encountered software problems, which made it unable to dock with the space station and forced it to return to earth in advance. NASA review found that Boeing needs to "correct 80 problems" in order to send the Starline spacecraft into space for a second test flight. Since then, all problems seem to have been corrected < p > this mission is Boeing's second attempt to send its Starline spacecraft into space and dock with the international space station. In this flight, the Starline spacecraft will be launched with ula carrier rocket, unload important goods at the space station and return to earth after a period of time. If the mission is successful, Boeing will start a manned mission, just as SpaceX does with the manned dragon spacecraft, between the earth and the international space station < p > during this launch, the Starline spacecraft will carry 400 pounds (181 kg) of cargo for the international space station and its crew, and bring back more than 500 pounds (227 kg) of cargo from the space station, proving its value as a means of transport. In addition to supplies and equipment, a dummy named Rosie the rocketer was also aboard the spacecraft during the test flight. She will be tied to the seat of the commander of the Starline spacecraft, and her main goal will be to help maintain the spacecraft's center of gravity. Rosie will wear Boeing's blue spacesuit, and astronauts will wear the same spacesuit when they fly on Starline spacecraft in the future < p > Boeing hopes to succeed because it lags behind rival SpaceX in the competition to provide NASA and other space agencies with commercial flights to the international space station. Elon Musk's space company has sent two groups of astronauts to the international space station and plans to send a third group of pilots into space in October. If the test flight is successful, Boeing is expected to send NASA astronauts Sunita Williams, Josh Cassada and Jeannette EPPs and Japanese astronaut Koichi Wakata to the international space station in 2022 < p > after the completion of the space shuttle program in 2011, NASA signed a multi billion dollar contract with Boeing and SpaceX to provide shuttle services to and from the earth and the international space station for its astronauts, and hopes to end the United States' dependence on Russian spacecraft. SpaceX's project is progressing faster and has now carried out three manned missions, including manned test flights. Boeing's project is falling behind < p > Starline spacecraft is a new type of reusable manned spacecraft, which is designed to send astronauts to the international space station and other unfinished low earth orbit destinations. The Starline spacecraft is slightly larger than the Apollo spacecraft, but smaller than NASA's Orion spacecraft. It can accommodate up to 7 people. It is connected to the space station in orbit for up to 7 months and can be reused up to 10 times. Starline spacecraft can be launched by a variety of launch vehicles, including Atlas V, delta IV, Falcon 9 and Vulcan centaur. Instead of splashing into the water like earlier NASA spacecraft and manned dragon spacecraft, the aircraft landed on the ground with buffered airbags < p > Steve stich, project manager of NASA's "commercial astronaut", said not long ago that he was full of confidence in the second space test flight of Starline spacecraft. "We hope everything goes well and have done all the preparations for it," he said. StarCraft is a great vehicle, but we know how difficult it is to develop it. I'm looking forward to learning more in this test flight. "（ Small) < / P > < p >