THIS DAY IN SCIENCE: There's A Face on Mars (Viking 1) in 1976

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What is a photon?

What is a photon?

A photon is a purely quantum mechanical object representing the smallest piece of energy (or quanta) for light. Every quantum particle is a packet of energy though, so how do we tell photons apart from electrons, quarks, and neutrinos? Click here to go the source for...
Empty Space is NOT Empty

Empty Space is NOT Empty

An atom is mostly empty space, but empty space is mostly not empty. The reason it looks empty is because electrons and photons don’t interact with the stuff that is there, quark and gluon field fluctuations. It actually takes energy to clear out space and make a...
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