The following is not a question: Can something come from nothing?

[max-greece]

Except a photon isn't merely energy. It an elementary particle which carries energy proportional to the radiation frequency.

I'd give you a duality between energy and a particle if you like - but I don't think you can get away with just energy.

IMO the main point is that the photon came from an existing electron.

The other point is that, more generally, space-time is itself something, and so it's impossible to have nothing in our universe.

Actually, specifically, the photon did not come from an existing electron. The electron lost nothing in the production of the photon.

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Where is it possible to have nothing?

That's a nonsensical question.

Actually, again, it isn't. There is no evidence that "nothing" - depending on how we want to define that, can actually exist.

According to Quantum Theory nothing (nothingness to be clear) is unstable. It's fully possible that true nothing cannot exist.

Things get further confused if time exists only as part of a universe. With no time everything happens instantaneously so nothingness wouldn't even exist for the smallest unit of time possible.