Explore the real Solar System and thousands of star systems. Watch Phobos dash through the Martian sky or observe a sunset on a planet with multiple suns. Accelerate time, compare planet sizes, and visit scientifically grounded stars and exoplanets—in VR or on desktop.

Public builds
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Counted once we have watched for 90 days (since 21 Oct 2026)
Distinct builds deployed to a game's public (default) Steam branch, as Steam's client network describes them.
Checked within minutes of each Steam change. Observed since 21 Oct 2026.
Source: Steam client network (PICS), App info, public branch. Full methodology
Latest public build
Build 25791105
Update posts
8 postsPosts announcing an update, tagged or not
Posts in a game's official Steam news feed that announce an update: tagged as patch notes by the developer, or plainly about a patch or a released update.
Source: Steam Web API, ISteamNews/GetNewsForApp. Full methodology
Typical gap between builds
Not enough builds yet| Build | Went live | Patch notes |
|---|---|---|
| 25791105 | Save Failure Fix |
From Steam’s client network, last checked . Builds before 21 Oct 2026, when we started watching, aren't listed. Patch notes are the developer’s update post from an hour before to a day after the build. Not every build gets one. How we count
| Posted | Update |
|---|---|
| 7 Oct 2026 | Save Failure Fix Patch notes |
| 7 Oct 2026 | It's the Little Things Patch notes |
| 19 Sept 2026 | Data Update Patch notes |
| 10 Aug 2026 | Atmosphere Improvement Patch notes |
| 2 Aug 2026 | VR/Desktop Start Bug Fix Patch notes |
| 15 Jul 2026 |
| Correction for terrain failure to re-load. Patch notes |
| 5 Jul 2026 | Bug fixes, memory leak, brown dwarf limb. Patch notes |
| 3 Jul 2026 | One to One Scale Update Update |
Steam keeps no record of past build numbers, so before 21 Oct 2026 a game’s update history comes from its own Steam news: posts tagged as patch notes, and untagged posts that plainly announce a patch or a released update. Older posts are still being read in, most played games first. How we count