Universe Sandbox Official

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

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) universe sandbox

Use the Habitable Zone view (shortcut 'H') to see where liquid water can exist. Will it be a stable yellow dwarf like

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) you can flesh out their history.

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