The Big Bang! Space-time did not exist before the Big Bang so there can be no earlier events.
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The Big Bang is believed to have occurred approximately 13.8 billion years ago, making it the earliest event in time that we know of.
The visit of the relatives
Flash Back
Yes. But earliest is also an adjective, the superlative of early (most early). adjective - the earliest time adverb - he arrived earliest
sundial
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