Universe Sandbox May 2026

Every cosmic story needs a center. You can begin by adding a to an empty simulation.

Will it be a stable yellow dwarf like our Sun, or a volatile blue giant ? universe sandbox

You can even create a "Tiny System" by shrinking a star down to the size of a flashlight while keeping it hot enough to support life. 2. Build the Worlds (Planetary Composition) Every cosmic story needs a center