ok first thx for ure help again qrtxian
i already looked at the milky way map but in my milky way custom map the earth is an random planet. so it has no earth texture.
are u sure u have an earth texture in ure game when u start this map?
if yes that would be strange.
but im also gonna try this salvation mission and ure (hopefully) helping advise.
im gonna tell how it worked out 
EDIT: can u tell me which of this editors i should use and where i can find this earth data? my modding knowledge is very limited.