T'Vienor Expanse

This is a tiny little pocket dimension that is reached through a very specific wormhole that exists over a planet that I will figure out eventually. Probably a dead one. Within this dimension, it should be rather difficult to escape again, and most of the people within simply stay there.
There's a whole solar system in there. The borders look a bit like a normal star field, but distorted. It moves around a bit, where its parallel space is in our universe, and you can see that as it shifts. A bit like going to warp, but a much larger bubble. The wormhole itself is rather reddish and appears a bit jagged from the back end.
Getting in is easy and should take a simple Difficulty 1 roll.
Inside should take a few sessions to deal with the planets and the people there and the issues.
The escape is the tricky part. Constraints to put on it include:

• Timing (need to leave at a particular moment)
• Type of engine (they'll need to effect an upgrade before they try to go)
• Navigation difficulties in leaving
• In there in the first place to get a particular resource or item or perhaps to save a particular person

Reasons they would want to escape sooner rather than later:

• They were only a shuttle going in and not enough resources
• Some kind of radiation means there's a medical toll the longer they stay
• The people who live there attack
• Or they want to make sure y'all stay so they're trying to kidnap and hold the crew

Three planets and a blue sun makes sense. Have only one be terrestrial, and have a bunch of moons on the gas giants be the places where life developed.

Type

Pocket Universe