Does a vacuum have a temperature?

Question

Seeing as a vacuum contains no matter, and temperature is associated with movement of gas particles and so on, would that suggest a vacuum has no temperature?

Answer 1

That's correct; if you had a perfect vacuum, it wouldn't have a temperature.  However, it's impossible to have a perfect vacuum, even in deep space there are always a few particles around.

Answer 2

Temperature has no meaning when applied to a vacuum.  Temperature is the measure of average kinetic energy, and since there is no matter, there is no thermal energy, and therefore there is no temperature.  A vacuum is the absence of matter.

Answer 3

Temperature is energy irradiated by matter.

So, to be possible to have temperature, it needs a physical matter.

The vacuum has no matter so it is impossible to have temperature.

But the vacuum can transport radiation, generated by matter, including temperature of matter.

So, vacuum will not present temperature, but may present the equivalent energy generated and irradiated by a thermal event in matter. One example; the energy rays we receive from our mother star, the sun. Solar radiation will hit our atmosphere and our planet, what causes heat, thus temperature, but temperature itself does not come from the sun, it is generated here, by the collision of the solar energy radiation with the local matter.