Minecraft Java 1.21 Mods
Browse 24 free mods for Minecraft Java 1.21 — popular picks include Ad Astra: Per Spatium, galactic create, Star Wars Planets Stellaris.
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Ad Astra: Per Spatium
An addon for Ad Astra, Stellaris improving space exploration by adding new structures.
galactic create
A massive Create addon introducing oxygen mechanics, custom planets, inter-dimensional spacecraft, alien mobs, and procedural space structures.
Star Wars Planets Stellaris
Explore the beautiful and vast universe of Star Wars !
Star Wars Planet Stellaris
Explore the beautiful and vast universe of Star Wars !
Create: Fallout
A Fallout-inspired expansion for Create, adding iconic Nuka-Cola items, Sugar Bombs, bottle-cap currency, pre-war consumables, and new wasteland structures like the Red Rocket Station and Broadcast Station.
Galaxy Under Chaos - A Star Wars Experience
"Galaxy Under Chaos" is a Minecraft Star Wars mod where players explore a galaxy in turmoil. Discover unique planets and powerful technology. Customize lightsabers, face new mobs, and navigate an ever-changing universe full of chaos and mystery.
The Bottomless
There are beautiful void cosmic biomes in the dimensions
Beyond The Ocean
A Mod that let´s you explore beyond the oceans of minecraft. New ocean themed planets on a post End level difficulty. New structures, mobs, items and technologies. New adventures and a new story ready to be told.
Aliens & UFOs
A mod that adds Aliens, their spaceships and much more!
![Rustling Spots: Team Rocket Addon [Cobblemon]](https://pub-2ae937f770284535a96c3330f91236aa.r2.dev/thumb/modrinth/395199.webp)
Rustling Spots: Team Rocket Addon [Cobblemon]
Adds rare Jessie and James interruptions to Rustling Spots, turning exploration encounters into scalable Team Rocket trainer battles with unique dialogue and rewards.
Laicaps
[Alpha] A fantasy space exploration mod - for neoforge 1.21.1
Space Update
dannytaylor's April Fools' 2025 "Update"
Stellar Depths
Drift through cosmic emptiness. A space exploration mod built around scale, silence, and the unknown.
Carpet Sky Additions Miller's Planet
Carpet extension providing a world like Miller's Planet from movie Interstellar, with new ways to obtain resources.
Altar of the Sunne & Ultra Space by Ritsen
This datapack adds the Altar of the Sunne, Ultra Space and ways to obtain all Ultra Beasts, Necrozma and the Cosmog line to Cobblemon.
Aquatic Creatures
Did you know we know most about the space than own ours oceans? I want to make you feel that with this mod
Space's Better Stuff
This mod aims to add many improvements to the game such as an End Update, Deep Dark Update and much much more. The current version of the mod has added new features in the end; the mod is in active development and will continue to receive new features!
Pixelmon: No More Ultra Space
No More Ultra Space [Pixelmon Sidemod] removes Ultra Space and wormholes for good, relocating every Ultra Beast into matching overworld biomes with beast chests, horde battles, and ultra terrain blocks all aquirable from the overworld.
Space Mod
Do you hate when you fall thought the void in the end and lose everything? This mod adds a space dimension below the end!
Mars Renaissance
The Mars Planet add to Minecraft!
Cobblemon // Project: Spacetime
A Cobblemon side-mod that adds space-time distortions to Cobblemon, inspired by Pokemon Legends: Arceus.
Alienated
Adds a whole new planet to explore!
![KingCraft [FORGE]](https://pub-2ae937f770284535a96c3330f91236aa.r2.dev/thumb/curseforge/417086.webp)
KingCraft [FORGE]
Travel to a different planet? Fight new bosses? Discover new game mechanics? Welcome here.
JustSpace
A mod that adds what it is called. Just space. A new space dimension with mysteries to reveal and lots of asteroids to mine.