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If electrons are responsible for color, then why can we see white light travel through a vacuum?

(no matter = no atoms = no electrons = no color ??????????????)

You got me there

Motive: Set up a (high school) physics exhibit on light.
Criteria: N/A. Let creativity reign.
Goal: What better way to educate than to explain the history.

What I have in mind,

Empedocles:...

Thanks fellow snowtan

Night vision device using an IR laser sent through a (biconcave) lens?

I'd like to set up an equation to calculate watts being diverted. Problem is it calculates the dioptric equivalent. Can I...