We will know what exactly happened as soon as we will have Grand Unified Theory. Time machine isn't required. Moreover that machine can't help us, because no particles can survive in enviroment with temperature above 10^14K.
"why did it happen here ?
Why didn't it happen somewhere else ?"
Because this happen everywhere in our Universe. Big bang could not happen somewhere else, because there wasn't/isn't somewhere else (so far).
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