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#
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)
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