“孩子们,这次旅行一共需要七天时间。”亚当斯机长向大家介绍道,“之所以需要那么久,是因为曙光太空城建立在月球轨道上。你们一定很好奇,为什么它要建在那么远的地方?为什么不建在地球轨道上?那不是能更方便运输与联络吗?这是因为如果建立在地球轨道上,地球的引力就会将太空城引向地球,导致太空城坠毁。而如果要抗拒地球引力,就需要不间断地输送大量的能量,产生推力来 ”It took a total of seven days for the kids to travel this time.“ Admiral Captain introduced that ”it took so long because the dawn space city was built on the moon’s orbit. You must be curious why it wants Built so far away and why not built in orbit? Is not it easier to transport and contact? This is because, if established in the Earth’s orbit, the Earth’s gravity will lead the space city to Earth, resulting in space city Crashed.And if you want to resist the gravitational pull of the earth, you need to continuously deliver a large amount of energy and produce thrust