SpaceX's "Starship" SN9 exploded during its test flight. What part of the problem went wrong?

The Starship prototype of the U.S. Space Exploration Company (SpaceX) exploded during the test. The three engines of the prototype were shut down after ignition, and then ignited again to prepare for landing as planned. However, an explosion occurred after returning to the launch pad. This accident triggered widespread concern and heated discussion among netizens. What exactly happened is described in detail below:

1. Inadequate preparation in the early stage. SpaceX engineer Innsbruck said in the live broadcast that most aspects of this test flight "look very good". Through this flight of about 10 kilometers high, engineers can collect data to improve the design of the "Starship" . ?We just need to work a little more on the landing. ?he said. According to the Federal Aviation Administration, the "Starship" prototype Starship was originally scheduled to conduct a test flight last week, but the plan was delayed because SpaceX violated a public safety agreement with federal regulators. After SpaceX took "corrective measures" and ensured compliance with public safety rules, it is reported that SpaceX plans to replace its main rocket "Falcon 9" with the Starship series, and eventually complete the mission of carrying astronauts to the moon and Mars and perform missions. Freight tasks. Therefore, only rigorous preparations in the early stage can ensure nothing goes wrong.

2. The possibility of an accident caused by engine failure, the power source of the spacecraft, is still very high. The starship's self-inspection system detected an abnormality in one or more of the three Raptor engines and automatically stopped the launch. After a series of checks and confirmations, it took off again. Video shows the starship's epic flight, with its explosive ending. Musk later tweeted that during the landing process of the spacecraft, the pressure in the head fuel tank was low, which resulted in a faster landing speed. But we already have all the data we need, and Musk had previously predicted that the launch and landing had only a one-third chance of success. The three Raptor engines installed on Starship Starship experienced engine shutdowns about 100 seconds after launch. In the end, only one of the engines on Starship Starship was working, and one engine had reached the limit of full thrust. Starship Starship The ship reached the 12.5Km flight target, but in the end, a Raptor engine shut down and lost power during the landing process. This caused the Starship's reverse thrust to be too low and failed to decelerate sufficiently, causing the Starship's landing to occur. Although there was an explosion during landing, the explosion hardly damaged the facilities at the launch site.

3. An error occurred in the landing process. According to information, "Starship" integrates spacecraft, rockets and lander, and plans to transport people and cargo to deep space destinations. Musk has publicly expressed the hope that "Starship" can be used to transport satellites, global travel and Mars immigration in the future. The Starship will put satellites into orbit at a lower cost than the existing Falcon. In fact, Musk's expectations for the prototype Starship were not too high, so only the landing process went wrong, which was considered a successful test, exceeding the expectations of SpaceX and most professional observers. SpaceX hopes that the final Starship spacecraft can realize human missions to the moon and Mars at a low cost, and achieve Musk's wish to immigrate one million people to Mars.