cannot believe i am typing this again, read this then go read earlier post. go figure out how stupid you are for not getting it. this is the only time i am doing it, and no more. if i put this down in plain simple words and u still cannot get it. sorry u are really not qualified to talk to me. u want to know more u study hard work your way to uni and learn it yourself
vacuum is constantly creating particle and antiparticle, meaning vacuum it itself is energy, yes void = energy, and mass = energy. upon understand this basic, you realised your question is fucking stupid if you are looking it from Quantum mechanical point of view. where it came from? its already there for vacuum itself is a field of unstable flux of energy. Casimir effect in vacuum is the result of these unstable flux of energy where the boundary conditions are sets, where the pressure difference due to the energy difference draws the 2 plates inwards. the only issue with this theory is where are all the anti particle now, but seems like they via the collider realised that the creation of particle and anti particle is not really symmertrical as mentioned by earlier on, however this theory i believe is not yet widely accepted.
what explode? what kind of fucking question is that. its merely emergence of particle and anti particle due to inbalance of energy at a certain point to a very large extend assymmeterically. but what causes this large extend at the big bang, we currently do not know. however lots of evidence like background radiation etc points and strongly agrees with this theory, a lot more than a stupid book call bible
if you think i am talking cock (which sounds like how can void = something), this is normal, for this is totally against common sense in macroscopic world. this the exact reason why A LOT student struggled when they first come across this topic. for it make zero sense