Which TTRPG system is this for?
Traveller and system-agnostic

What Stellar Phenomena did you use?
Jump gate

Did you participate in Hard Mode? Which extra rules did you use?
There is a hard mode version of the adventure at the end of the main text Traveller version. It is system agnostic, limited to one page of A4, has the secondary theme of an unexplained mystery and uses no diagrams or images.