There are ways to get from planet to planet with almost no energy: http://en.wikipedia.org/wiki/Interplanetary_Transport_Network http://en.wikipedia.org/wiki/In

There are ways to get from planet to planet with almost no energy: http://en.wikipedia.org/wiki/Interplanetary_Transport_Network http://en.wikipedia.org/wiki/Interplanetary_Transport_Networ... There must also be ways to get from star to star. If there are Sun-Earth Lagrange points, there must be Galaxy-star Lagrange points, and a way to transfer from the Sun's to Alpha Centauri's. This would probably take a while though.