One thing about the Official Traveller Universe that has bothered me for quite a while is the lack of any Frontiers. The unexplored regions where an intrepid crew could strike out and maybe hit the jackpot, or die with no one knowing their fate.
Looking at the Traveller Map, the Imperium
What is your definition of frontier?
Some dictionary definitions are:
1) a border between two countries
- have that with the Imperium
2) a region that forms the margin of settled or developed territory
- you have this with the 3I setting. I'm sure you can find a moon or asteroid or even a planet that is undeveloped even within the Imperium. You certainly could travel out, or already live on the far edges of mapped space and go exploring.
Considering just the Imperium and it's borders with the Aslan and Vargr could perhaps be like looking at just one country, like France and saying they have no frontier because there is Spain, England and other countries on their borders. The "frontier" is out there, just not on your doorstep.
Often the "frontier" was seen by most people through history as the border of ones own culture and boundaries and learning. A frontier was something to be conquered as there were people already living there. Due to writing, books, and modern technology, it became easier for people to document and share their information. Thus making the "frontier" less unknown.
Perhaps trying to start a human settlement in dangerous and unfamiliar Aslan space not unlike going west during early America times and settling America amongst the Native Americans.
I don't know my canon, but just because information is available in game materials for the GM, on the map and in setting books, does the Imperium know it? Is this information acquired from actual scout missions to every single system of what is often an enemies territory? Was it gathering via espionage? In times of peace from the race you've encountered? Is it accurate? Does someone from the Imperium need to go check?
For the real unknown frontier, places no
known intelligent species has explored, you have to keep in mind that jump ships are common transportation in this setting. It would be like in our current day saying lets get in a plane and go explore the frontier.
To explore further one likely needs to be a government or corporately backed exploration operation and not as likely the intrepid crew on a retired scouts ship. A long, dangerous trip to the totally unknown frontier likely takes a bit of planning and building specialized ships and uses well trained crew.
But when you reach this new location, low and behold, you very well may meet your native American, Eskimo, or Asian parody. A newly encountered intelligent species or even other mankind that have already explored vast areas and they have contact and shared information with others that live well within your peoples "frontier". Instantly a vast track of the "frontier" the size of all currently known space could be gone.