The Typhon Expanse is a highly dangerous area of space that borders on Romulan, and Federation claimed space. Known for its temporal disturbances it is an otherwise visually average collection of many star systems and other objects.
It had never before been charted or even explored until the USS Enterprise, NCC-1701-D entered it, circa stardate 45652. On this occasion the vessel was trapped in a time-loop vortex with the older USS Bozeman, which ended up being brought forward in time.
The Typhon Expanse's many unusual phenomena and temporal features means it usually has to be circumnavigated by vessels wishing to reach space beyond (including the Duronis system) and as such acted as a natural border between the Federation and relatively vast amounts of uncharted space.
Added to this are the many records from Federation member worlds and other unaligned species of ships lost with in this region of space. Records that seem to indicate that more than 100 ships have been lost in there. In fact many of the species who have had numerous losses to this section of space have developed their own names for it. Some of these are the “Tear of Death”, “Hells Postierior Opening”, “Kolar’s Breath”, "Turd of the Spirits", "Malik's Vomit". and “Ut’ Ovon”.
Since the destruction of the Hobus star and subsequent internal disorganization that resulted within the Romulan Empire, Federation and Starfleet Intelligence operatives were able to secure data that showed that the Romulans had lost a number of ships in this region as well.
So far probes and deep scans have identified the following subspace conditions with in the expanse. A subspace anomaly is a very broad term for any sort of extraordinary disruption in subspace. Often, they can take the form of irregularities such as distortions, fractures, tears and ruptures. Oftentimes they can damage equipment and personnel, altering physics and the Human brain.
- Subspace barrier is the term used of subspace when it acts as a barrier between two places.
- An anti-time eruption was located inside a subspace barrier. A convergence of three inverse tachyon pulses from three different time periods ruptured the barrier and paradoxically created the anomaly. A new subspace barrier was generated artificially around the anomaly, with static warp shells, to collapse it.
- A subspace distortion, subspace disturbance, or subspace deformation is a warp in the fabric of space. Subspace distortions could be caused by spacecraft utilizing warp drive, or by other, more exotic phenomenon. A Cochrane is the mathematical unit for measuring subspace distortion, named after Zefram Cochrane, the inventor of warp drive on Earth. The phase fluctuations in subspace fields are in turn known as cochrane distortions.
- A subspace eddy is a disruptive spatial phenomenon.
- A subspace fracture is a phenomenon which can be created as a byproduct of a polaric ion explosion, and which can allow for travel through time.
- A subspace implosion is a violently destructive phenomenon that could be produced using a warp core.
- A subspace instability is a subspace phenomenon that is left as a result of a wormhole opening.
- A subspace rift is a rupture of a region of subspace instability where subspace extrudes into normal space due to excessive exposure to warp field energy. Such a phenomenon is characterized by tetryon radiation and high-energy distortion waves, and is extremely sensitive to the exposure of further warp field energy.
- A subspace rupture is a phenomenon which can allow for passage to a subspace layer. Creating a stable warp field is impossible in the vicinity of a subspace rupture, and, if large enough, a rupture can be extremely destructive, even having the potential to destroy an entire star system.
- Subspace sandbar was a term coined by the crew of the USS Voyager to describe a region of space which intersected a transdimensional realm inhabited by photonic lifeforms. In this region, the area between space and subspace had become unstable, allowing a subspace layer to extrude into normal space.
- A subspace shock wave is a violent release of energy which travels at faster-than-light velocities, and which can be created by the destruction of large stellar bodies, such as a planet or a star.
- A subspace sinkhole is a naturally-occurring phenomenon capable of producing an extremely strong gravity well, posing a potential hazard to any spacecraft navigating too close. Much like quantum singularities, subspace sinkholes are monodirectional, preventing escape for any ship pulled inside. Extreme gravimetric shear from a sinkhole can prevent the formation of a stable warp field, further decreasing the chances of escape.
- A subspace tear is a violently destructive phenomenon which could be created as a byproduct of an isolytic burst. Attracted to the energy output of warp cores, such a tear could continue to expand until sealed.
- Subspace turbulence is a subspace anomaly which causes severe disruption in subspace.
- A subspace vacuole is a type of dimensional distortion which can act as a means of transit between dimensions. Subspace vacuoles can also pose a hazard to navigation, due to the fact that contact with a vacuole while traveling at warp speeds could lead to the destruction of one's ship.
- A subspace vortex (also called an energy portal) was an extremely fast method of propulsion utilized by the Xindi. Capable of transporting a vessel dozens of light years in a matter of hours, the vortices were opened through the generation of a phase deflector pulse.
- A neutrino cloud is a spatial anomaly composed of neutrinos, that generates an electromagnetic field. It is normally undetectable to sensors.
- A plasma drift is a nebula-like interstellar phenomenon.
- A particle fountain is a small but dangerous spatial anomaly. In the Alpha Quadrant, the Federation lost over a dozen ships attempting to study one. Consequently, the phenomenon was poorly-understood.
- An energy field is general term to refer to any defined spatial area that has some sort of energy-related effect within that area. Many energy fields occur naturally in space, but artificial fields can exist too. Usually technological devices such as field generators, like the one used by the Whale Probe, create the latter, though not in every case: Certain (often powerful) lifeforms, such as ma:Q\Q, Armus, and the Sky Spirits, have the ability to generate energy fields at will.
- A thoron field is a field comprised of thoron particles. One can use a thoron field to distort and jam the sensor readings of threat forces.
- A hydrogen cloud is a nebula composed of hydrogen.