Nasa discovers 'motorway' network between planets Nasa says an interplanetary superhighway discovered by one of its engineers will make space travel simpler. The solar system 'motorway' is a virtual network of winding tunnels and channels around the Sun and planets. Each planet and moon has five locations in space called Lagrange points, where one body's gravity balances another. Spacecraft can orbit at those points while burning little fuel. He came up with the superhighway by mapping out all the possible flight paths among the Lagrange points to see how fast or slow the spacecraft would travel. Experts say the superhighway...