帮忙回答以下英文问题,要用英语回答0What is the "Big Bang"? when did it happen?

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帮忙回答以下英文问题,要用英语回答0What is the "Big Bang"?     when did it happen?
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帮忙回答以下英文问题,要用英语回答0What is the "Big Bang"? when did it happen?
帮忙回答以下英文问题,要用英语回答0

What is the "Big Bang"?     when did it happen?

帮忙回答以下英文问题,要用英语回答0What is the "Big Bang"? when did it happen?
The "Big Bang" is a theory about the beginning of our universe.Nobody can be sure about the exact time in which it happened.