Vacuum has friction from an effect similar to the Casimir effect

[wnoise]

Only for accelerating systems. The system here is spinning, which is an acceleration.

[nazgulnarsil]

vacuum can have temperature? am i reading it wrong or....?

[geuis]

In physics, "temperature" is the same thing as "speed". The faster the movement of particles in a given amount of space, the "hotter" it is. The terms are interchangeable.

There is also a common misconception that you would freeze almost instantly if you jumped out of an airlock in space. Quite the contrary. A vacuum is actually an incredibly efficient insulator. Hence vacuum thermoses. Your body would not lose heat very fast. Not having a helmet on, though, would be very bad for your health.

[maxbRuns]

Yeah, because the electromagnetic field contains energy, which can be converted into other forms. A system's temperature is 'how readily it gives off energy'. It need not have anything to do with particles or speed.

[mickdarling]

I believe the temperature reference is in regards to the object's temperature.

[wnoise]

When you accelerate through it, yes.

http://en.wikipedia.org/wiki/Unruh_effect