Multiverse rifts (Classic Journeys Era)

Multiverse rift is the general term for parts of spacetime randomly connected with other universes, but smaller than the inversion formed by the Moebius Effect.

Falari
In 3000, a Falari vessel with universe-jumping capabilities jumped from Hiverspace to Normalspace near Jupiter. Through either a failure in the drive itself or simply an overstressing of the fabric of time-space, it caused the fabric to rupture and tear, producing thousands of portals between normalspace and alternate universes, probabilities, and dimensions that would open and shut at random, and became more and more severe as time went on.

During this time, alternate Castori bombed Sivad, candy-colored, metal-eating rabbits attacked Ungstir, and an alternate Galactix manned by Phyrrian-humanoid hybrids appeared, as well as dozens of other strange events.

Eventually, a coalition of a future Kip Caspar, the Maltarians, and the Ri'kammi were able to repair the rifts, and prevent time-space from tearing itself apart.

Sanctuary
In September of 3006, coincidentally with a Castori-Republic joint venture to scan Earth, a wave began to expand outward from Earth at tens of millions of times the speed of light. As it passed, it caused disorientation and nausea among people and numerous glitches in time-sensitive machines. The wave also left behind a scattering of glowing rifts, at least some of which contained dangerous temporal distortions.

It was theorized that the rifts were connected with the departure of Sanctuary from this universe. The rifts caused great concern, shutting down many shuttle routes. However, they faded and disappeared over six months, the time the travelers spent on Sanctuary.