In the Stellar Empire universe, energy weapons exist, but when fleets go to war, nothing delivers blunt, unarguable destruction like a slug of metal fired at orbital velocity. That’s why railguns, coilguns, and other mass drivers dominate the battlefield.
The Physics at Work
A railgun works by using electromagnetic force to accelerate a conductive projectile down a pair of rails. Current surges through the rails and into the projectile, generating a magnetic field that pushes the slug forward. In real-world labs today, prototypes can launch projectiles at several kilometers per second. In space combat, Stellar Empire railguns scale that up to frightening extremes firing tungsten or depleted uranium slugs at tens of kilometers per second.
Lets ask the internet for a real world comparison;
A 10 kg slug at 20 km/s carries the same kinetic energy as a half-ton of TNT.Fire a salvo, and you’re punching holes straight through armor, hulls, and sometimes entire ships. There’s no need for explosives. The velocity is the explosive
Engineering Challenges
Space railguns have to solve problems modern prototypes still wrestle with:
Power draw, each shot consumes gigajoules of energy, demanding capacitors and fusion-level reactors.
Heat dissipation, rails wear out fast, so Stellar Empire navies line them with self-repairing composites and magnetic buffers.
Recoil, firing a 10 kg slug at orbital velocity imparts equal and opposite momentum to the gun platform. In space, that means your warship lurches unless you counterbalance with thrusters or fire from paired barrels in opposite directions.
Taking this into account, and leaning into our gravity wells, engineers often mount railcannons along the ship’s spine, tying them into the opposite pull of the gravity well. The result is a weapon that can unleash devastation without snapping its own ship in half.
Tactics & Doctrine
Railguns excel in pre-plotted, long-range engagements. Because there’s no “beam glow” like a laser, shots are nearly invisible until impact - only detected by sensors tracking their launch vectors. A fleet with precise firing solutions can saturate an enemy formation with hypervelocity darts before the other side even sees them coming.
That’s why crews like Jea, Kask, and Oskar, in our Born of Ash & Iron story, who once manned a hidden deep-space railcannon battery represent the essence of vengeance in the Stellar Empire. Their surgical barrage against a fleet of thirty-three battle barges wasn’t random destruction. It was premeditated, physics-driven justice, every slug guided by orbital math and fury.
Why Railguns Endure
Lasers and plasma may look flashier, but in the end, railguns are elegant in their simplicity: No need for volatile warheads, No reliance on atmospheric effects, No fancy optics to scatter energy. Just mass and speed. The most primal weapon in the galaxy, scaled up to empire-shattering proportions.
In the Stellar Empire, when people whisper of “the thunder that kills worlds,” they’re not talking about beams of light. They’re talking about railguns.
Next in The Science of Stellar Empire: we’re talking Shielding and Hull Alloys. I’ve been name dropping a number of hulls, armors, and shields in the recent Empirefall Chronicles, so I owe you an article on that.