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I studied that electronics is the branch of physics which deals with the practical applications of moving electrons through vacuum, semi-conductors and gasses. Can electrons move through vacuum?

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Just our of curiosity, why would you imagine there was a problem with it? After all there would be nothing in the way ... –  dmckee Mar 18 '13 at 16:52
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up vote 19 down vote accepted

Yes. That is the operating principle of this device, among many others: enter image description here

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This is a fun answer LOL :-D, +1 –  Dilaton Mar 18 '13 at 17:04
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Sad thing is, in twenty years kids will have to ask their grandparents what this huge smartphone has to do with electrons in vacuum. Oh well, at least there'll still be electron tunnelling in MOSFETs, I guess... –  Tobias Kienzler Mar 19 '13 at 6:23
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