On June 28, 2015 (May 13, 2015 lunar calendar), Musk was frustrated by the SpaceX Falcon 9 rocket explosion in the air. Picture: Falcon 9 rocket launch picture: rocket explosion in the air The US Space Exploration Technology Corporation (SpaceX) launched a Falcon 9 rocket on the 28th to carry out the International Space Station cargo supply mission. The rocket suddenly exploded and disintegrated after 2 and a half minutes of liftoff, and the cargo hold carrying about 1800 kilograms of supplies was also blown up. This is the third failure of the space station supply mission in 8 months. The originally planned rocket recovery and landing test also failed. At 10:21 a.m. Eastern Time on June 28, 2015, the Dragon spacecraft carrying out the cargo mission was launched from Cape Canaveral Air Force Base in Florida on a recoverable rocket, the Falcon 9. The video showed that the rocket had an abnormality after flying for about 149 seconds, and suddenly exploded in the air and disintegrated, and the debris fell into the Atlantic Ocean. "It appears that there is a problem with the liquid oxygen tank of the first-stage launch vehicle," said Elon Musk, the chief executive of SpaceX. This time the spacecraft is carrying supplies including water, food and science experiment supplies for the astronauts. One important piece of equipment is a new interface for future commercial missions. This is SpaceX's eighth mission to deliver supplies to the space station since 2012, and it is also the first failure. For the International Space Station, there have been two failed deliveries in a row. In April, a Russian supply spacecraft lost control after liftoff and crashed on its way back. Last October, the Orbital Sciences cargo spacecraft exploded during a launch in Virginia. NASA Administrator Charles Bolden issued a statement on the 28th expressing regret for the failure of the launch that day, but he said that the three astronauts on the International Space Station were safe, "They have enough supplies for the next few months, and we will work closely with SpaceX to resolve the issue and resume flight as soon as possible." The 28th is the 44th birthday of SpaceX CEO Musk. He originally planned to try the first-stage rocket to return to the landing test independently according to the set route, and specially painted the words "I still love you" on the recovery platform. In January this year, SpaceX conducted the first rocket recovery test in human history. Due to the landing angle problem, the rocket exploded on the recovery platform. The second test in February was abandoned due to huge winds and waves, and the rocket fell directly into the sea. During the launch in April, the air pressure valve of the thruster temporarily failed, causing the rocket to slow down and hit the offshore platform, causing an explosion. Musk said he would not give up trying to recycle rockets. "If rockets can be reused like airplanes, the cost of entering space can be reduced by a hundredfold." He believes that recyclable rockets will be revolutionary for the human space industry.