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GsTSaien t1_jee13cy wrote

Reply to comment by Mitchelltrt in ELi5 If the universe is expanding, what is it expanding into? by cashmoneyhash

Particles just appear???? Wait are you sure? Wouldn't that require creating more mass and energy from nothing?

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Mitchelltrt t1_jee33x6 wrote

Nope. Particles appear in pairs, then collide with their pair and disappear. It is honestly freaky. Like, subatomic particles appearing in electron-positron or proton and its pair that I can't remeber the name of.

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