A free app for Android, by WPCons.

In our Solar System Simulator you can play as either an astronomer or a meteorologist.

With this app you can simulate the entire solar system and change its characteristics (mass, size and velocity). The app has been designed to simulate the motion of all objects in our solar system in real time and it is accurate in terms of time and space. It includes the planets, the Sun, the Moon, the planets’ moons, the asteroids, the comets, and the stars. You can also play as a meteorologist and change the temperature, pressure and composition of the atmosphere.

The Sun’s surrounding stars are also included. You can make the stars go supernova and change their size and mass.