How many rockets exploded in NASA?

NASA has experienced several rocket failures throughout its history, with notable incidents including the Apollo 1 fire, the Space Shuttle Challenger disaster in 1986, and the Space Shuttle Columbia disaster in 2003. In terms of rockets exploding during launch, there have been several launch failures, including the loss of the Delta II and Falcon 1 rockets. Overall, while NASA has faced numerous challenges, it has also achieved many successful missions and advancements in space exploration.