Scientists unveil plan designed to cut cost of space travel

"Professor Shane Ross, from Virginia Tech in the US, said: ''Basically the idea is there are low energy pathways winding between planets and moons that would slash the amount of fuel needed to explore the solar system. "

http://www.telegraph.co.uk/science/space/6170961/Scientists-unveil-plan-designed-to-cut-cost-of-space-travel.html