The temperature in space is close to absolute zero.
PS Absolute zero is the lowest limit of the thermodynamic temperature scale, a state when enthalpy and entropy of a cooled ideal gas reach their minimum value, taken as zero kelvins 0 K (−273.15 °C; −459.67 °F).
Interesting fact.
How do we know this is a fact?
Must be a lot of superconducting going on there!