The star system generator charts a whole system in one click, laid out the way a sci-fi sourcebook draws one. The star glows off the left edge of the sheet, its orbits sweep across as arcs, and five to eight worlds sit on them, each drawn and labelled by type: molten rock close in, a garden or ocean world if one formed in the habitable zone, banded gas giants with rings and moons further out, and ice at the edge. An asteroid belt, a few stations and jump points, and a survey legend with the star's class and catalogue number finish the chart.
How the system is built
Every roll starts with the star. It's one of five classes, from a dim red M dwarf to a hot white A star, and the class sets its colour on the chart and, more usefully, where its habitable zone falls. A red dwarf's zone hugs the star, so anything living there is close enough to be tidally locked and scorched by flares. A bright F or A star pushes the zone outward and leaves room for several hot, airless worlds inside it.
The planets follow that layout. Worlds closer to the star than the habitable zone come out molten or barren. Inside the zone there's a real chance of an ocean or garden world. Past the frost line, the distance where water freezes out, the system turns to gas giants and ice. The belt sits near that line, where it does in our own system. Gas giants carry one to four moons and about half of them have rings; smaller worlds sometimes have a single moon. The habitable zone is shaded faintly green across the orbits so you can see at a glance which worlds are candidates for life.
Names follow the convention astronomers use for exoplanets: the star's name plus a letter, starting at b for the innermost world. The Arkiel System runs Arkiel b, Arkiel c, Arkiel d outward, which reads right to anyone who's followed real planet discoveries, and leaves the colonists free to give any world a proper name of its own.
What the tags give you
About one world in four carries a tag on the chart: a jump point, a relay buoy, a customs station, a naval picket, a mining outpost, a listening post, or a derelict. These are the reasons to stop in the system rather than pass through it. A customs station at the gas giant means the party gets boarded; a derelict past the belt means a salvage job; a naval picket at the garden world means somebody important lives there. The caption under the chart adds one more rumour, like a survey that never filed its report on the third world.
Using it at the table
A system chart is what the crew looks at when they drop out of jump. Hand it over as the navigation display, or keep it behind the screen as the GM's map of where things are. It's system-neutral and works for Traveller, Stars Without Number, Starfinder, Mothership, Coriolis, or a homebrew setting, because it describes astronomy and points of interest rather than any game's rules.
It pairs well with the galaxy map. Roll a galaxy to set the great powers, pick a spot on an arm, then roll the systems the party actually visits. Distances between worlds on the chart are for layout, not for plotting a burn, so set travel times to whatever your game's drive rules say.
Free SVG and PNG downloads
Both formats are free for your games, streams, and campaign notes. The PNG is a 1920-pixel render that looks right on a VTT, a second screen, or a Discord channel. The SVG is the original vector file: open it in Inkscape, Affinity, or Figma to rename worlds, add a station, mark the party's ship, or draw a course. Everything on the chart is drawn by our own code, so there's no attribution to carry and no asset licence to read.
What it won't do
This charts a system, not a planet's surface or a starship's interior. There are no hex maps of worlds, no deck plans, and no orbital mechanics you could compute a transfer window from. Orbit spacing is evened out so every world fits on the sheet, which real systems don't bother to do.
Name the worlds, crew the ship
The text generators next door fill the chart in. The planet name generator writes a full world, with history and a hook, and draws it into this same chart as the gold-ringed planet in the habitable zone. The alien race name generator tells you who lives there, the spaceship name generator names the ship that brought the party, and the galaxy map generator shows where this system sits among the powers that want it.