Kerbal Star Systems 2 (KSS2) is a large interstellar planet pack for Kerbal Space Program, built for players who have explored the stock system, pushed past the Outer Planets, and started wondering what comes next.
KSS2 sends your space program far beyond familiar space into fully original star systems shaped by real astrophysics, bad ideas, and the Kerbal method of learning by catastrophic failure. Expect long transfer windows, hostile environments, tight orbital dynamics, and destinations where small design flaws only become obvious years into a mission.
Rather than chasing spectacle alone or making false promises, KSS2 focuses on systems that feel intentional. Visuals, planetary behavior, and gameplay challenge are designed together to reward careful planning, creative engineering, and the occasional rapid unscheduled disassembly.
Actively developed and maintained by one of the longest-active KSP modders, KSS2 aims to be stable, ambitious, and very difficult to break, unless you’re really trying.
Leave Kerbol behind and enjoy breaking new star systems.
All systems are original creations. They take cues from real space, then the Kerbals made them… stranger.
Included Systems Overview
| In-game System | Inspiration | Description |
|---|---|---|
| Aethera | TRAPPIST-1 | A compact red dwarf with tightly packed worlds, extreme tides, and unforgiving environments. |
| Nova Kirbani | Alpha Centauri (A+B) + Proxima | A three-star family with complex dynamics and worlds locked in a slow gravitational dance. |
| Kormin | Luhman 16A | A glowing brown dwarf that refuses to behave like a proper star. Dim warmth, strange worlds, and planets that never quite cool off. |
| Seereon | Sirius | A brilliant star with a dense companion, excellent for navigation, less great for anything that melts easily. |
| Orbel | Pollux | A bloated giant star past its prime, slowly reshaping its planets through stellar evolution. |
| Kerr | Galactic Center / Sgr A* | A black-hole system where physics cries a little. Extreme gravity, strange light, and hazards Kerbals were never meant to face. |
| Pandor Expansion | Pandora (Avatar) | A lush, bioluminescent moon orbiting a gas giant around Nova Kirbani A. Beautiful, hostile, and scientifically rewarding. |
| Red Blalo Expansion | Crimsica (Helldivers 2) | A debated red variant of Blalo, featuring oxidized terrain and altered crimson oceans. |
| Requirement | Details |
|---|---|
| KSP Version | 1.12.x |
| RAM | 16 GB minimum |
| GPU | 1–2 GB VRAM recommended |
- Download the latest release: GitHub Releases
- Follow the Installation Guide
- Install all required dependencies
⚠️ Manual install only, CKAN is not supported
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|---|---|
| Kormin and its moon system | Kerr |
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|---|---|
| Aethera erupting in a stellar flare | Polynovin and its satellites |
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|---|---|
| Surface of Xolem | Surface of Blalo under dim skies |
📸 More screenshots and renders are available on the Wiki and Discord.
- Fully original interstellar star systems with intentional progression
- Late-game exploration beyond Kerbol and OPM, designed for long missions
- Multi-star dynamics, extreme orbits, and hostile environments
- Dynamic atmospheres, auroras, and volumetric cloud systems
- Exotic astrophysical phenomena (black holes, unstable stars, relativistic effects)
View of Kerr from Grav (Scatterer + EVE Volumetrics)
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Orbel & Seereon Completion
Finalizing the Orbel giant system and the Seereon binary, expanding existing worlds with additional planets, moons, and late-stage stellar evolution effects. (In active development) -
Pulsar System
A high-risk, high-reward system built around an active pulsar, featuring extreme radiation, relativistic visuals, and environments Kerbals were never meant to survive. -
Outer Planets & Kerbol Revamp
Adds new gas giants and icy moons beyond Eeloo while modernizing the Kerbol system with updated visuals, balance tweaks, and improved exploration gameplay.
KSS2 is designed to coexist with other major planet packs and visual mods.
A full, versioned compatibility matrix is maintained on the Wiki:
Wiki → Compatibility
Credits
TheSpacePotato • OoglakKerman • JadeOfMaar • Spaceman • Emu • Caden • Chaotic Protocol • Ciara Rayne Cloud • Bogue • Community testers and players
Extra thanks to TheSpacePotato, co-pilot since 2016.
Licensed under CC BY-NC-ND 4.0
- ✅ Share non-commercially with credit
- ❌ No remixing or derivative works
- ❌ No asset reuse without explicit permission
Official source: https://github.com/StarCrusher96/Kerbal-Star-Systems-2
Any patches that change starting bodies, progression, or balance are third-party experiments and are not supported or endorsed.
Bug reports, balance feedback, or issues caused by such patches will not be addressed.
KSS2 prioritizes originality, proper licensing, and respectful collaboration.
➡️ Full policy: Wiki → Transparency & Asset Policy
KSS2 is not built to impress in screenshots, it’s built to hold up after hundreds of in-game years.