It was reported on August 12 that sending astronauts to the moon is not easy and requires a lot of rocket fuel support, according to foreign media reports. Nearly half a century ago, the Saturn V rocket that sent NASA's Apollo spacecraft to the moon weighed 6.5 million pounds (about 2948 tons) when the fuel tank was full, and needed 20 tons of rocket fuel per second p> < p > today, decades later, Elon Musk, CEO of SpaceX, is trying to achieve similar great goals using starships. This time, it needs a lot of refueling in the track to reach the destination. Not long ago, SpaceX's competitor blue origin complained that SpaceX may need up to 16 launches to fill up enough fuel for a starship to go to the moon p> < p > but musk refuted in his tweet on Wednesday: "16 flights are impossible. The payload of the Starship into orbit is 150 tons, so it only needs to be launched eight times at most to fill the Starship's 1200 ton fuel tank. At the same time, starships are much lighter without flaps and heat shields. The moon landing leg won't add much weight. After all, the gravity on the moon is only 1 / 6 of that of the earth. For this purpose, it may only need to fill half the fuel tank, which only needs four launches. " p> < p > musk added that even if 16 launches and docking were required, there would be no problem. He added in his tweet: "SpaceX has conducted more than 16 orbital flights and docked with the space station more than 20 times in the first half of 2021, even though it is much more difficult than docking with our own spacecraft." p> < p > < p > nevertheless, launching the Starship and its huge super heavy rocket booster is much more difficult than SpaceX's main Falcon 9 rocket, and even much more difficult than the much more powerful Falcon heavy rocket. This raises another key question: does musk imply that astronauts must wait in orbit for half a year to board a spacecraft to the moon p> < p > the complexity involved is shocking. First, Falcon 9 booster has only 9 Merlin engines installed, while the super heavy rocket booster will use 29 larger Raptor engines. So far, SpaceX has not completed the first orbital test launch of the Starship p> < p > but such a launch may not be too far away. SpaceX recently integrated a starship prototype on a super heavy rocket booster for the first time in preparation for its first orbital flight. If all goes well, the Starship will enter orbit before the end of summer. Only then will SpaceX be able to solve the next obstacle to the moon landing: refueling in space, which involves the docking of two starships( (small)