Head to the freighter on Feros (in the Zhu's Hope Colony). You'll find a computer terminal here that, when decrypted, will alert you to investigate supply shipments that have diverted course in the Voyager Cluster.

Quite simply, if you then save your game, and subsequently reload it, you'll be able to decrypt the computer again for the same information you just got. This is a slow, slow process, but it is a real way to have access to infinite experience points. If you have the patience to do it, give it a go.