There are cubes scattered throughout each world called Datacrons. Somewhat hard to find, and have a quest triangle over them. Some reward permanent + abilities to stats, others reward shards and they all reward a lore story. Beginning world of Korriban has 3, one near shuttle, one in open area of Tomb that has the heroic instances area and another near the wilds and is viewable when flying over in a taxi. Drummond Kass there are 5, I've only found one near the spaceport, supposedly another nearby and I have yet to find the other 3.