The Gate

The Gate was an inter-universal wormhole orbiting 28 AU from Sol.

Names
At the time of its formation and discovery, humanity had only one name for the Gate, barring interlingual translations: its existence was so singular and so groundshaking, both figuratively and literally, that no other name was necessary.

Once closed, and time enough had passed that it was remembered only by the oldest of humanity, feelings on the Gate - and thus, feelings on how to refer to it - diversified. While most historical literature still refers to it as "the Gate", some in the Commonwealth of Mereid would begin to refer to it as the "Rainbow Bridge", referencing several mythologies in Earth history: primarily the Chumash story of creation, wherein humanity was led from the island of its origin to a new continent via a bridge made from a rainbow.

The Church of New Eden's scriptures refer to it as "Eden's Gate", "the Gates of Heaven", and "the Pearly Gates", among at least a dozen less prominent names, depending on the translation and section in question.

Topology
The Gate's topology was unusual in that, while one end was static within the Sol system, the other was actually spread out across an indeterminate number of points in the Tadpole galaxy. The mechanism by which one determined a destination point was unknown: leading hypotheses include angle of approach, velocity, time of entry, and simple randomness.