Future spacecrafts may use the magnetic fields around Earth and other planets to bounce around the Solar System, providing a completely new method of space travel. It's all very complicated if you aren't some sort of rocket scientist, but the basic idea involves using radioactively charge particles to propel a craft with no rocket boosters required.
What would be really exciting about this is that once a craft got out into the solar system, it could use planets such as Jupiter, which magnetic fields far stronger than ours, as a new launching off point, sending them speeding in a different direction. It would make our solar system a sort of cosmic pinball machine, with crafts able to bounce between them to get where they're going. Will this actually become a reality? Who knows, but it's certainly a pretty sweet idea.
Via New Scientist