Not a sling shot in terms of gaining energy, but there's an interesting trick I don't really understand: https://en.wikipedia.org/wiki/Interplanetary_Transport_

Not a sling shot in terms of gaining energy, but there's an interesting trick I don't really understand: https://en.wikipedia.org/wiki/Interplanetary_Transport_Network https://en.wikipedia.org/wiki/Interplanetary_Transport_Netwo...