Rules

The system is Fate Accelerated.

DF.0

Fate Accelerated uses 4DF, which is quite coarse. If this coarseness becomes a problem, then the group can switch to 4DF.0:

GSET D4F.0$(2'28-2'28)/10

This preserves the standard deviation, but produces tenths. It's then meaningful to have tenth-scale modifiers, etc. Round the final result near.

Home

There are four interstellar states, collectively called the "Big Four".

Republic Of Heaven

a chinese-descended culture, the first of the three "star states"; it formed after the bloody fall of the People's Republic, decades before the Ellison drive enabled terran colonialism. Since the fall it hasn't been wasting resources anymore, and it's the wealthiest state today.

Sovereign Worlds Alliance

A looser government than the others, with various euro-indic cultures and considerable pride in small cultural divisions. A number of member worlds have odd governments, which is tolerated as quaint eccentricity. It's the least wealthy of the Big Four, but that still puts it ahead of all smaller states.

Sphere Of Prosperity

An american/japanese culture, with a corporate tone. The Sphere makes extensive use of space stations, often built into asteroids. Their military favors few expensive craft, and the Sphere Head Office can easily divert its wealth into more when a conflict starts.

Terran Confederation

A mixed culture with strong classism. Characters are either nobles or commoners. Nobles are more likely to look baseline… but baseline-looking commoners probably are baseline. The Confederation is particularly fond of genteel planetary living. It still considers itself the gold standard for culture.

Smaller States

There are also a number of smaller states, generally single-planet, even if that means the half-dozen moons of a gas giant. Some are politically aligned with one of the Big Four, others are (fiercely or casually) independent.

Apes & Angels

Second-order life, multicellular but unintelligent, is known on quite a few worlds within easy hyperspace ranges.

Third-order life, transcendental, appears to take large swaths of space. It appears everywhere any of us have ever been is within an area once held by the Ta Li Si Na, and their ruins range from almost a billion years ago to a heartbreakingly-close 200 million. We don't know what third-order states exist beyond the "fallow" area left by the Ta Li Si Na's collapse.

HyperspaceIsAScaryPlace

Subspace is boring, it doesn't support interesting or complex physics, nor large amounts of energy. It therefore doesn't support physics as we know it.

Thirdspace is where we live, where particles as we know them can exist. In order to exist in subspace or hyperspace, ships must bring a "thregion", a region of thirdspace. Thregion generators normally function in both subspace and hyperspace.

In hyperspace, only quasiparticles can survive for any length of time. Thirdspace matter/energy will promptly collapse into a froth of quasiparticles. Lone particles mostly have half-lives under a millisecond; a toralon(a type of soron) has a half-life of 12.8 hours, and several other sorons have half-lives over a second. However, there are many kinds of quasiparticles. Most useful are asymmetric pairs, referred to by their asymmetric property; for example, a "positive-mass pair" has a positive-mass particle and a slightly-smaller negative-mass particle.

Hyperstrings, ranging from a hundred feet thick to several miles thick, thread their way over hundreds or thousands of lightyears, or twist together into storms. The friction in hyperstorms produces clouds of heavy quasiparticles, which swirl around the storms. Even away from the storms, lighter quasiparticles produce an ambient pressure on the order of a few kPa.

A regular hypership is fairly complex. It has a conformal thregion, using an array of tiny generators built into the hull, to maintain thirdspace around itself. It has a hypershunt, which takes minutes to charge up, and can shunt the ship to hyperspace(or back) on a charge. It has a hyperdrive, usually a Furlan drive in the 3F to 9F range, to move through hyperspace. And it has a thirdspace drive, usually super reactionless, to get between space stations and free space.

A military mothership usually adds a thregion bubble generator, so its parasite craft can exist within the bubble. A hyperfighter usually has a conformal thregion and a high-Furlan hyperdrive, but no hypershunt or thirdspace drive.

While in hyperspace, the shunt is normally left charged, and there's nine standard safety protocols that can automatically trigger a shunt back to thirdspace if the thregion looks like it might fail.

A ship is normally streamlined(or non-streamlined but with a thregion bubble), to improve top speed in hyperspace to c × Furlans^3. Divide top speed by 10 with neither streamlining nor a bubble.