Spacetime Intertubule

Spacetime Intertubules (or Temporal wormholes) were a extremely rare astronomical phenomena hypothesized by the Crataxians ca. 2342.

Spacetime Intertubules were basically wormholes, although with temporal properties. Allowing transport from place to place, although through time.

Hypothetically, Spacetime Intertubules were naturally formed by a irregularity in a wormhole which caused it to descend into/react with the temporal continuum. Or naturally by a wormhole-like phenomena tunneling through the border of the spatial and temporal continuum.

It wasn't until 2475 when the crew of the Inventum, by the help of Crataxian Ensign Zlmir, discovered the first, potentially natural Spacetime Intertubule.