Can Lightning Travel Through a Vacuum?

[jobyts]

Can lightning travel through vacuum? Does sitting in a vacuum chamber reduce/increase/no effect the probability of being hit by lightning?

If lightning can travel through vacuum, I would imagine there wouldn't be any heat or light - hence it would be just an electric shock. True?

 

[mgb_phys]

No - lightning is the plasma from air that has been heated enough to lose it's electrons and glow white hot.
In a perfect vacuum there is no air (or other gas) to glow so no lightning.
You can have an electrical current flowing in a vacuum once the field gets large enough to pull electrons off the surface of an electrode and then dragged by the field to another electrode.