CurseForge · Minecraft mod
Cosmonautics: Planetary Expansion
Adds five landable planets to Create: Cosmonautics, each with its own terrain, weather, creatures, dangers and planet suits.
Quick answer
Which Cosmonautics: Planetary Expansion release should I use?
Cosmonautics: Planetary Expansion planetary_expansion-1.0.2.jar targets 1.21.1 with NeoForge. The project page does not say whether this file belongs on the client, dedicated server, or both. All 6 required mods have matching files.
Where it goes
Is Cosmonautics: Planetary Expansion required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does Cosmonautics: Planetary Expansion planetary_expansion-1.0.2.jar need?
planetary_expansion-1.0.2.jar. Change the file and its required mods may change too.
Install Create Deep Seas [BETA], Create Nuclear, Create Cosmonautics, Create and 2 more first. We found matching files for this game-version and loader setup. 12 come through another mod in the chain.
12 extra mods were pulled in by other dependencies. Indented rows show who needs each one. We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add Cosmonautics: Planetary Expansion without breaking your instance.
Built for Cosmonautics: Planetary Expansion planetary_expansion-1.0.2.jar. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use planetary_expansion-1.0.2.jar. It targets 1.21.1 with NeoForge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install Create Deep Seas [BETA], Create Nuclear, Create Cosmonautics, Create and 2 more first. We found matching files for this game-version and loader setup. 12 come through another mod in the chain.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside planetary_expansion-1.0.2.jar. It opens that exact file at the source.
About this project
What does Cosmonautics: Planetary Expansion add?
Cosmonautics: Planetary Expansion (AI assisted proyect)
Warning: this proyect is beta do a copy of your world before put this mod.
Create: Cosmonautics lets you build rockets and fly to the Moon. **Planetary Expansion gives you somewhere to land.**
Five new worlds, each with its own dimension, terrain, weather, dangers and rewards — and a reason to come back.
The planets
**Mars** — Red dunes, canyons, highlands and polar caps. Meteorite craters with rare cores, half-buried ruins of old
missions, and **dust storms** that push you around and hit you with debris.
**Venus** — A scorching world of basalt plains, shield volcanoes and lava rivers. The heat wears down your armor and
**acid rain** falls from an amber sky. Rich in Create: Nuclear ores.
**Thalassa** — An ocean moon under a cracked shell of ice. Dive hundreds of meters into the dark: hydrothermal vents,
crystal geodes, glowing creatures… and something enormous passing in the distance.
**Ignis** — An airless volcanic world orbiting a gas giant: lava seas, ash plains and sulfur fields, under a sky full
of planets.
**The Ice World** — Eternal night, glaciers and crystal spires, with blizzards that freeze you to the bone.
Planet suits and progression
Start with the **Basic Space Suit** (it works like the Cosmonautics gear: breathing, jetpack, thrusters, anchor boots).
Each planet hides the materials for an **upgrade template**: upgrade your suit at a smithing table into the
**Impact** (Mars), **Glacial** (Ice World), **Hazard** (Venus), **Sea Diver** (Thalassa) or **Thermal** (Ignis) suit.
Not ready yet? Craft **survival kits** (cooling gel, chemical heater, dust filter) for your first expedition.
Creatures
- **Thalassa:** lantern fish, vent crabs that guard their chimneys, giant blue king crabs, and the eyeless
**abyssal stalker**, which hunts by sound. - **Ignis:** lava-dwelling **magma snails** — and the rare **magma titan**, which spits fire if you anger it.
Machines for your ship
- **Warp Drive + Navigation Console:** an end-game machine that jumps your ship to the orbit of any planet,
with a full-screen map of the solar system. - **Gravity Generator:** normal gravity on board, powered by Create rotation.
- **Inertial Dampener:** a multiblock that stops your ship (or circularizes your orbit in space).
- Hologram table labels, windmills that spin faster in storms, beds that work in space (and on moving ships).
Requirements
- Minecraft 1.21.1 · NeoForge
- Create (6.0+), Create: Cosmonautics, Sable
- Create: Nuclear and Create: Deep Seas (oxygen diffusers, sea pressure)
FAQ
**Does it work in multiplayer?** Yes, it must be installed on both server and client.
**Can I add it to an existing world?** Yes. New planets generate when you first visit them.
**Shaders?** not at all but works.
License
GPL-3.0 — source code: https://github.com/Antme08s/planetary_expansion Not affiliated with the Create or Cosmonautics teams.
Project description from CurseForge.
Pick your setup
Cosmonautics: Planetary Expansion by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.21.1
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Cosmonautics: Planetary Expansion versions and loaders
planetary_expansion-1.0.2.jar
13 Nov 2026
planetary_expansion-1.0.1.jar
13 Nov 2026
planetary_expansion-1.0.0.jar
13 Nov 2026
Looking for an older file? The official CurseForge project page is in Resources.