But how could it be if you're in an exploratory campaign?
I mean I really do understand jumping from one known system to another, and looking up some form of rating on the local amenities. But if you're blazing new trails, and the Ref rolls up a TL for a world that the players haven't been to, then how would they know the TL ahead of time?
Sensor readings from the star system next door will tell if they have radio. Well, if they had radio a few years back - you could always arrive and find something dramatic has happened since then. How they use their radio signals may give you some clues as well, hints that they're signaling satellites in orbit, for example. If your computer can make sense of the transmissions, you may get some images to give you more details. Depends on you having some pretty decent detection gear, but a scout should have that.