The Start Of The Universe
Universe SandboxI tried to simulate what the Singularity before the Big Bang would be like. Warning: requires a NASA computer.
Other
300subscriptions≈ +1 subscribers / day · 9 hr. agoUpdated: Jan 17, 2025
Mods: Universe Sandbox
Mods for your games from Steam Workshop and Source.
Counts describe mods indexed by GameRadar. Workshop popularity is measured in subscriptions.
Indexed mods: 575
Avatar - Alpha Centauri
Universe SandboxHere Is An Recreation Of The Alpha Centauri Trinary From Avatar!, Based On The Game And Movie Cannon From The Avatar Wiki, Note That Some Things May Be Slightly Incorrect In The First Verison But Its Still Mostly Accurat
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299subscriptionsno growth · 11 hr. agoUpdated: Jan 21, 2026
Proxima Centauri Rekijiggered
Universe SandboxA brief explanation Proxima Centauri is the closest star and stellar system to us. We have studied it perfusley and plans for probes are already being talked about. Three planets exist, an unconfirmed Mercurian world (d)
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294subscriptionsno growth · 41 hr. agoUpdated: Mar 4, 2025
Solar System 4 Billion Years Ago
Universe SandboxThe Solar System is a dynamic place over long stretches of time, and 4 billion years back the entire system was different in one way or another! From Mercury to the Kuiper Belt, multiple objects not in the base game have
Other
292subscriptionsno growth · 41 hr. agoUpdated: Jun 20, 2026
We found it
Universe SandboxLore For a long time, Scientist across the galaxy unable to find the hidden mass that should exist in the Universe, many proposal and theories was made but there's no avail, A act to restart and refound physics and math
Other
290subscriptionsno growth · 41 hr. agoUpdated: Jan 24, 2022
Gemstone Teapots 2
Universe SandboxThese are some more teapots made out of gemstones. They all are based off of real gems and realistic colors. It includes lots of more cool gemstones. I hope you enjoy! Like and subscribe! Feel free to us it in any of you
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234subscriptions≈ +1 subscribers / day · 11 hr. agoUpdated: Feb 7, 2026
217subscriptions≈ +1 subscribers / day · 11 hr. agoUpdated: Aug 6, 2025
Theta 1.7
Universe SandboxA habitable exomoon bigger than earth,orbiting a gas giant in the habitable zone.It's 20 light years away from Earth.Enjoy.
Other
198subscriptionsno growth · 41 hr. agoUpdated: Jan 3, 2026
183subscriptionsno growth · 41 hr. agoUpdated: Apr 9, 2026
Cold Star, Hot Universe
Universe Sandboxthis is the first of its kind, a Stellar Air Conditioner many unique properties like boiling mountains & forever twilight. lore: earth time-traveled to the early universe to kill god and destroy the laws of thermodynamic
Other
181subscriptionsno growth · 41 hr. agoUpdated: Nov 2, 2024
=+= Gygan System =+=
Universe SandboxWELCOME TO THE GYGAN SYSTEM Welcome to Gygan, a very polished and highly habitable system with many planets, civilizations and more! 1.71: very small changes to some habitable planets i'll finish them later down the line
Other
162subscriptionsno growth · 9 hr. agoUpdated: Oct 19, 2026
HIP 81208 Exoplanet System
Universe SandboxYoung dynamic quadruple system with near-perpendicular orbits // HIP 81208, also known as HD 149274, is a real exoplanet system located 485 light-years away in the constellation Scorpius, part of the Scorpius–Centaurus s
Other
119subscriptions≈ +3 subscribers / day · 11 hr. agoUpdated: Sep 28, 2026
Terraformed Mars Venus & Mercury
Universe SandboxTerraforming or Earth-shaping is the hypothetical process of deliberately modifying the atmosphere, temperature, surface topography or ecology of a planet, moon, or other astronomical body to be similar to the environmen
Other
86subscriptionsno growth · 43 hr. agoUpdated: Oct 7, 2026
Ora Pax system
Universe SandboxOra Pax is similar to our system 4 rocky planets, 4 gas giants, and a exoplanet, but it has a habital planet, a habital dwarf planet, & 2 habbital moons, all of them having has life.
Other
72subscriptionsno growth · 9 hr. agoUpdated: Sep 13, 2026
WD J0832−0408, The Star That Drank Pepto (ACTUALLY LEGIT)
Universe Sandboxhttps://images.steamusercontent.com/ugc/358399162714061671/4AA68E9A6FAAAB6CD20001DF585ADE7D7EFCCB09/ You might have heard of WD J1330+6435, Here but what about WD J0832−0408? You haven't. This star also included in the s
Other
71subscriptions≈ +16 subscribers / day · 41 hr. agoUpdated: Oct 31, 2026
EVERY STAR (189)
Universe Sandboxhttps://images.steamusercontent.com/ugc/358399162714061671/4AA68E9A6FAAAB6CD20001DF585ADE7D7EFCCB09/ Update: Added The New Study Of Colored White Dwarfs
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53subscriptions≈ +15 subscribers / day · 41 hr. agoUpdated: Oct 28, 2026
53subscriptions≈ +9 subscribers / day · 9 hr. agoUpdated: Oct 24, 2026
Kronos Galaxy 2.0 inner system
Universe SandboxThis is an extremely large system with many planets and moons. It will run slowly on low and most likely mid range computers. A completely remastered version of the Kronos Galaxy. No descriptions yet because I'm too lazy
Other
45subscriptionsno growth · 41 hr. agoUpdated: Oct 27, 2026
Folly's TRAPPIST-1
Universe SandboxArtistic rendition of TRAPPIST-1 and its planets. TRAPPIST-1 is an ultra-cool dwarf star in the constellation Aquarius, 12.5 parsecs from the Sun. It hosts a system of 7 planets (plus one unconfirmed, unlikely one) in a
Other
45subscriptionsno growth · 11 hr. agoUpdated: Sep 27, 2026
Sun & Nemesis! (alternate reality)
Universe SandboxIn this reality, the solar system and its celestial bodies are a lot different. Some planets are closer or farther from the sun. 4 planets are habitable, one is kind'of. Some dwarf planets became Nemesis's planets, and N
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43subscriptionsno growth · 43 hr. agoUpdated: Oct 4, 2026
40subscriptionsno growth · 41 hr. agoUpdated: Oct 28, 2026
persona system
Universe Sandboxa binary star system consisting of two yellow dwarfs and seven planets, the system is currently under development.
Other
37subscriptionsno growth · 41 hr. agoUpdated: Sep 5, 2026
Baker Solar Dozen System
Universe Sandbox2026: After 1049 years of going to baker solar dozen system. & now at the solar system, at 3075. & now you here, you go to the other planet. & have fun!!!!!
Other
37subscriptionsno growth · 43 hr. agoUpdated: Oct 3, 2026
Hades System 0.06 Aller
Universe SandboxA system that uses the space goggles. Updates coming soon!
Other
36subscriptions≈ +1 subscribers / day · 9 hr. agoUpdated: Oct 23, 2026