http://www.stefanom.org/spc/
4.3M after a few tries...
Best score so far is 5,650,694 over 105.8 years. It looks really stable but then suddenly the starting planet shoots off into space. Weird.
...
Now I've got 10,329,012 over 188.3 years. It looked much less stable, but it lasted longer. That tiny starting planet came so close to the edge so many times.
...
Now I've got 14,999,531 over 479.6 years.
I just don't understand how the crowdedness bonus works.
Edit: Hahaha, managed to work a Brown dwarf into the mix and it stayed stable to the end for 44,689,741 points.