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@ couples of binary stars that revolve around each other and all revolve around big mass making a very beautiful stable art piece https://i.imgur.com/Ns7yBtv.png //Gravity fun at TestTubeGames _settings(gravity: r^-2+0.5*r, zoom: 1.09, n: 5 suns controlled by spring action); _type1(m: 10, col: 2, lc...

Many Thanks for the useful answer

https://image.ibb.co/eDObNH/12_negative_masses_confined_in_negative_mass_rings.png //Gravity fun at TestTubeGames _settings(gravity: r^-2, n:12 negative masses confined in negative mass rings; _add(m: -100, d: 10, col: 1, lcol: 2, pic: 1, x: -20, y: 150, vx=0, vy=0, t: 0); _add(m: -100, d: 10, col:...

When I start GR I have to load the code first then to switch on the GR option from setup. I am asking how to start directly with GR (and light speed value) such that it is already included in the code?

Oh my, negative masses! I would've loved to take a look at that kind of stuff... but... When I tried to use your code and it doesn't work. D: This is mostly because there's some unnecessary line breaks and its lacking the "Gravity Fun at TestTubeGames.com:" Also, you really should've used the code ...

ahmedkq 8 high -ve mass suns , 4 -ve mass bodies: [ForceG: -2,Qual: 1,Zoom: 1,xSet: 0,ySet: 0], [x0: 100,y0:0,vx: -8,vy: 0,t0: 0,who: 2,m: -1000], [x0: -100,y0:0,vx: 8,vy: 0,t0: 0,who: 2,m: -1000], [x0: 0,y0:100,vx: 0,vy: -8,t0: 0,who: 2,m: -1000], [x0: 0,y0:-100,vx: 0,vy: 8,t0: 0,who: 2,m: -1000],[...