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Nice job! this is a great simulation. Some ideas for the future: 

1) decouplers

2) angular friction

3) zoom in - out

4) atmosphere

these tips might be too hard, but I think it would be AWESOME if you manage to do it!

oh and another one: Map screen

I won't be updating it. But the source is available so you, or anyone else, can add features yourself.

Thank you for informing me about this