Actually, It is Rocket Science: RF generators by Nova Scotia's Nautel Ltd. help bring interplanetary travel within reach

摘要

If you want to travel to Mars, you'll have to wait until the two planets are at their closest positions, a phenomenon that happens every two years. Problem is, it takes around 10 months for a rocket to span the distance using conventional propulsion technology. By the time an astronaut crew reached the red planet, Earth would be too far away for the return voyage. That leaves two unappealing options: construct a rocket large enough to transport enough fuel and supplies for an extended stay (i.e. galactically expensive) or make the expedition a "one-way" trip.