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What I have found out so far is:

I have the gravitational force Fg= 7,12*10^-6 N,

and used newtons 2. law to find the spheres acceleration a=7,12*10^-8 m/s^2

I know the acceleration is not constant, because the gravitational forces increase as the spheres move towards eachother. But I think I will neglect this, and treat it as constant.

If I do so, could I use the equation:

X = x0 + v0x +1/2*ax*t^2

t = sqrt((2*x)/ax)= 84269sek ,

x = 0,003m, v0x = 0 m/s, x0= 0 m

I don't know if I can treat v0x as being 0, should it be v0x = a?

Is this way of, or am I on the right track?

all kind of help would be apprciated, thx