If an object has no molecules, the concept of temperature is meaningless. That's why it's technically incorrect to speak of the "cold of outer space" space has no temperature, and is known as a "temperature sink," meaning it drains heat out of things.
well this is what i have to say:
- temperature is a property of matter - there is no dispute there
- left over from the big bang, space contains matter (like stars and planets) distributed across over billions of light years
- space has a blackbody radiation (CMBR) equivalent to a temperature of 2.7 K, that is -270 degrees C
- that is, if you leave something (say soup) in space that is hotter than -270 deg C, heat energy will be transfered in the form of radiation (according to Stefan-Boltzmann law)
- so my soup will cool down and the temperature of space will increase
- the heat capacity of space is so enormous that the rise in temperature will be very small
- but there is a theory saying that... the entire universe will reach a constant temperature and all forms of energy will be converted to entropy
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