The Sun & the Eight Planets The Sun: Diameter: 1,391,000 km. You could fit 1.3 million Earths inside it. It contains 99.8% of all the mass in the entire solar system. Mercury: 57,909,050 km from the Sun. Diameter: 4,879 km. The closest planet to the Sun, with the most extreme temperature swings of any world—over 600°C between its scorching day and freezing night. Venus: 108,208,000 km from the Sun. Diameter: 12,104 km. The hottest planet in the solar system thanks to a runaway greenhouse effect, with surface temperatures hot enough to melt lead. Earth: 149,597,870 km from the Sun. Diameter: 12,742 km. The only known place in the universe harboring life. Mars: 227,939,200 km from the Sun. Diameter: 6,779 km. Home to Olympus Mons, the tallest volcano in the solar system at nearly three times the height of Mount Everest. Jupiter: 778,169,925 km from the Sun. Diameter: 139,820 km. The Solar System's cosmic defender; its immense gravity acts as a shield deflecting comets. Saturn: 1,432,605,297 km from the Sun. Diameter: 116,464 km. It is so massive, yet so completely composed of lightweight gas, that the entire planet would float in water. Uranus: 2,870,972,200 km from the Sun. Diameter: 50,724 km. An ice giant tipped almost entirely on its side, rotating at a nearly 98-degree axial tilt so each pole gets 42 years of continuous sunlight, then 42 years of darkness. Neptune: 4,495,060,000 km from the Sun. Diameter: 49,244 km. The windiest planet in the solar system, with supersonic winds recorded above 2,100 km/h.
Dwarf Planets Pluto: 5,906,380,000 km from the Sun. Diameter: 2,376 km. Reclassified as a dwarf planet in 2006, Pluto features a massive heart-shaped glacier of nitrogen ice called Tombaugh Regio. Ceres: 413,700,000 km from the Sun. Diameter: 940 km. The largest object in the asteroid belt and the first dwarf planet ever discovered, harboring significant deposits of water ice beneath its surface.
Deep Space & Interstellar Boundaries Kuiper Belt & Oort Cloud: Massive regions of primordial ice, rock, and dormant comets enveloping our solar system. Voyager 1: The farthest human-made object in existence (over 24 billion km away), carrying the Golden Record for extraterrestrial discovery. Proxima Centauri: 40,174,930,000,000 km from the Sun. The absolute closest star to our own. Traveling at 1,000 km/h, it would take over 4.5 million years to reach it.
Features for Sci-Fi Worldbuilding Procedural Planets & Moons: Generate everything from scorched lava worlds and toxic hothouses to massive, ringed gas giants and frozen terrestrial spheres. Deep Space Anomalies: Toggle your Deep Space Scanners to locate hidden Dyson spheres, derelict precursor probes, quantum wormholes, and rogue black holes. Dynamic Astrophysics Narratives: Every generated system comes with an auto-generated scientific report detailing its orbital mechanics, habitability, and resource potential.
Easter Eggs & Sci-Fi Presets The engine contains handcrafted logic for famous fictional universes and scientific concepts. Try generating these seeds: Famous Systems: Arrakis (Dune), Tatooine (Star Wars), Vulcan (Star Trek), Solaris, and Gallifrey. Tabletop RPGs: Type any standard 9-character Traveller Universal World Profile (UWP) code (e.g., "C5679A2-8") to instantly render a mathematically accurate, rules-compliant solar system and dossier for your sci-fi campaigns. The Quantum Realm: Type any atomic number (e.g., "element 79" for Gold) to generate a true-to-scale visualization of an atom, complete with protons, neutrons, and electron probability clouds. Cosmic Minigames: Generate the seed "waldo" to play a massive game of hide-and-seek across a procedurally generated solar system.