# Thread: A Challenge for all of us

1. A satellite is shot of the earth and must eventually fly around the moon to the unknown planet Mickey

Information:
Earth radius 6.378  106 m, mass 5.976 kg  1024.
Mon, 1.738  106 m radius, mass 0.0735  1024 kg.
Mickey, 5000 106 m radius, mass 5000 kg  1024.
Distance Earth - Moon 384.4  106 m
Distance Earth - Mickey 800  106 m

To make it a little easier, the Earth, Moon and Mickey are put in one line here is a model that can help you out a little:
r=sqrt(x^2 + y^2)
Fgrav=G*ms*Ma/r^2
Fresx=-Fgrav*x/r
ax=Fresx/ms
dvx=ax*dt
vx=vx+dvx
dx=vx*dt
x=x+dx
Fresy=-Fgrav*y/r
ay=Fresy/ms
dvy=ay*dt
vy=vy+dvy
dy=vy*dt
y=y+dy
Als r<Ra Dan Stop Eindals
t=t+dt

G=6,67E-11
Ma=6,0E24
Ra=6,4E6
ms=1,0E3
dt=10
t=0
x=0
y=1,0E7
vx=6,5E3
vy=0

THESE CHALLENGES CAN BE COMPLETED WITH COACH MODELLING
1: Modify this model so that the satellite is shot from the earth in a circuit around the earth
2. Modify the model so that the Moon is included in the model. Try to get the satellite in an orbit around the Moon.
3. Modify the model so that Mickey is included in the numerical model. Try to get the satellite to land on Mickey. Give the orbit of the satellite back into an xy chart.
4. For try hards: is it possible to get the satellite in an orbit around Mickey?

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3. succes, I tried but failed
I hope you can succeed

PS I'm from holland so dont' mind the bad grammar  Bookmarks
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