By the  end of 2022, spaceX was preparing for a key test ,starships first test flight  using  both parts of the racket. Musk  said the year  before that there was lot of risks associate with the  first launch 

 I would not say like ,it is likely to be success , but I think we will make a lot of progress .

The plan was for starship to take off from the launch part in Texas . The boost would then separate and fall into the Gulf of Mexico as the spaceX engines fired and took it in a   90 minutes flight . Then it would come down ,and crash in the pacific ocean ,  but that’s not what happened ,shortly  after starship launched at  9,33am eastern . A graphic  on the live stream  indicated that three engines were not working .  With more  appearing to  go out before the blast .

The shutter that was intended to separate from booster here . Didn’t 

After climbing 24miles , the racket began to tumble back to earth , and around 4 minutes into its flight , starship explored .SpaceX said a flight termination system  was  triggered on  both this spacecraft  and the  booster .

 When you have a failure ,you learned a lot from that failure  . So I think their plan was to test to the point of  failure ,and then let’s learn  from what  we can from that  failure ,so it never happens again .

tumble 翻滚

shutter 快门

booster 助推器