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from visual import *
giant = sphere()
giant.pos = vector(-1e11,0,0)
giant.radius = 2e10
giant.color = color.red
giant.mass = 2e30
giant.p = vector(0, 0, -1e4) * giant.mass
dwarf = sphere()
dwarf.pos = vector(1.5e11,0,0)
dwarf.radius = 1e10
dwarf.color = color.yellow
dwarf.mass = 1e30
dwarf.p = -giant.p
for a in [giant, dwarf]:
a.orbit = curve(color=a.color, radius = 2e9)
dt = 86400
i = 0
while 1:
rate(600)
dist = dwarf.pos - giant.pos
force = 6.7e-11 * 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
if i < 2000:
a.orbit.append(pos=a.pos)
i += 1
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