Solar is a Solar system simulation app.
Simply pressing the Start button will start up a simple pre-constructed simulation.
If you want to use to add custom planets you can do 2 things:
Up in the right corner you can see a box saying: Add a custom planet.
If you type in what you want in the boxes below and then press: Push new the new planet will appear.
create a file ending with .solsim
Now its time for you to add planets and a sun in the file
Here is a simple example:
___________
custom||450||500||10000000||90||0||0||1.1
custom||450||100||10||10||20||0||1.1
___________
The first item in the list is the name in this case custom.
Each entry(row) goes as following:
NAME||X|| Y|| MASS|| SIZE|| VELOCITY X|| VELOCITY Y|| BOUNCE