Universe Sandbox -

Once your planets are in orbit, you can flesh out their history.

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

Here is how you can put together a story using the tools available in the simulation: 1. Set the Stage (The Star) Once your planets are in orbit, you can

Every cosmic story needs a center. You can begin by adding a to an empty simulation. Set the Stage (The Star) Every cosmic story needs a center

Use the Habitable Zone view (shortcut 'H') to see where liquid water can exist.

Adjust the axial tilt to create extreme seasons or "tidally lock" a planet so one side is always burning and the other is always frozen. 3. Add the Details (Moons, Rings, and Life)

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)