What existed before the big bang?
What all thing are there inside big bang object ?.
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We don't have theories that can describe the big bang (or whatever happened) properly so we can't say anything definite about the big bang itself, let alone if/what was before it. We would need (at a minimum) something like a quantum field theory for gravity and we don't have one yet. We've no reason to think that's all we'd need.
It's not even possible (as I understand it) to define "before" the big bang. Time, in essence, started at the big bang. It has no common sense meaning beyond that.