We're moving, moving to actually is if we drive current in the opposite direction in the tether and if we could force the current to go the other way it becomes a propulsive device, so a propellantless spacecraft.

我们在移动，实际上是如果我们上电反方向牵引，如果我们能迫使电反方向动，它就变成了一个推进装置，就是一个无推进器航天器。