# from vpython import * G = 6.7e-11 # create objects giant = sphere(pos=vector(-1e11,0,0),radius=2e10,mass=2e30,color=color.red) giant.p = vector(0,0,-1e4) * giant.mass dwarf = sphere(pos=vector(1.5e11,0,0),radius=1e10,mass=1e30,color=color.yellow) dwarf.p = -giant.p for a in [giant,dwarf]: a.orbit = curve(color=a.color,radius=2e9) dt = 86400 while 1: rate(100) dist = dwarf.pos - giant.pos force = G * giant.mass * dwarf.mass * dist / mag(dist)**3 giant.p = giant.p + force*dt dwarf.p = dwarf.p - force*dt for a in [giant,dwarf]: a.pos = a.pos + a.p/a.mass * dt a.orbit.append(pos=a.pos)