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On September 1, NASA still insisted that its space launch system (SLS) carrier rocket is expected to complete its first flight this year. A spokesman for the agency also recently stressed: "we are working for the first launch of the Artemis return to the moon program by the end of this year." < p > however, some sources privately said that the SLS rocket and Orion spacecraft carrying out Artemis 1 mission may be launched as early as next spring, and summer is a more realistic target date. NASA's internal goal of testing and integrating rockets at the Kennedy Space Center has fallen behind by about two months, and key pre flight tests are still ongoing < p > figure: in June this year, NASA integrated the adapter of the space launch system (SLS) rocket with the core stage < / P > < p > NASA spokesman Kathryn Hambleton admitted that the agency's plan was being postponed. "NASA continues to novel coronavirus pneumonia cases in Kennedy area, and weather and the first flight test are also affecting our launch plan," she said. However, we are moving slowly towards the goal of launch and ensuring the safety of our team as much as possible. " < p > earlier this summer, NASA technicians and engineers completed the integration of SLS and its side booster. The Orion spacecraft's "Simulator" was then placed on top of the rocket. At present, NASA and its contractors are conducting vibration tests on the assembled rocket in order to better understand the difference between the natural vibration of the whole rocket and the vibration caused by external forces. This information will be entered into the flight software < p > NASA had hoped to complete this work in July, but Hambleton confirmed that vibration testing (or modal testing) was being carried out in the rocket assembly building at the Kennedy Space Center. After this test, the simulator will be removed and the Orion spacecraft and its launch abort system will be carefully stacked on top of the rocket. This process may take several weeks < p > after this assembly and further testing, SLS and Orion spacecraft will be sent to launch pad 39B for a pre launch state training (WDR) of key facilities and equipment. During this period, propellant will be injected into the rocket and procedures such as launch countdown will be simulated. However, the rocket engine will not ignite. The source said that the test may be conducted in November or December < p > after the test, the SLS rocket will return to the assembly building for final inspection and closeout. Assuming that WDR testing and other activities can proceed as planned, the SLS rocket may be launched next spring. However, if there is further delay or new problems are found in WDR, the launch is likely to be delayed until next summer < p > Hambleton said that NASA plans to provide the latest information on the launch date soon. She said that after the Orion spacecraft is modal tested and stacked on the top of the SLS rocket, the agency will announce the WDR and the expected launch date of the rocket < p > although the development of SLS rocket was several years later than expected and exceeded the budget by billions of dollars, its launch was a small miracle to some extent. For a large organization like NASA, it is very difficult to complete complex manned space missions, and the development of SLS rockets is technically and politically complex < p > worried about the unemployment after the retirement of the space shuttle, the U.S. Congress imposed the SLS rocket project on NASA and even stipulated its various component specifications to ensure that space shuttle contractors such as Boeing, Lockheed Martin, Northrop Grumman and Aerojet Rocketdyne continue to receive a large amount of space project funds. Despite financial support, these contractors still failed to deliver in time < p > the US Congress passed legislation in October 2010 to announce the launch of the SLS project. At that time, they expected the rocket to be put into use in 2016. Key supporters of the project include Bill Nelson, then a Florida senator and current director of NASA. He strongly opposes the efforts of the Obama administration, which wants to explore whether private companies such as ula and SpaceX can more effectively build large rockets for NASA < p > Nelson said at the time that NASA and its traditional contractors could do better than anyone. "The development cost of this rocket may be lower than we thought," he said. In NASA's authorization act, the cost of the project will not exceed $11.5 billion in five to six years. " Later, Nelson said, "if we can't build rockets with $11.5 billion, we should close the door." < p > however, more than ten years later, NASA has spent more than $20 billion on the SLS project. Nelson is no longer a U.S. senator, but the director of NASA, but the agency is still operating as usual& nbsp; （ Small) < / P > < p >

2023-03-22 10:04:42