Nowaday, The US has the most sophisticated spacecraft. But it hasn't ever developed a transport that can use very little energy. To overcome the grativational force of Earth, people have to apply a lot of thrust to encounter it to go to space. But why don't we try to change things around? I believe (although seems impossible) there are two methods to propel the rocket without fuel. First, scientists can find method to stop a tiny area's gravitational force, then we can just a...