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Space is pretty hot. One of the bigger challenges for NASA is keeping objects cool in space, particularly in Low Earth Orbit where satellites and spacecraft are continually exposed to friction and conduction off hot particles with very little radiative cooling ability.
For simple radiative cooling in 'cold' space, the equation would be of the form:
F(T)=F(0)e^(-k*t) Where T is time, F(T) is temperature as a function of Time, e is Eulers number and k is a coefficient of cooling.
Of course, all temperature measurements are in absolute, and K will vary with the emissivity of the particular body in space as well as the units chosen.
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