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We don't know. We can go back to within nanoseconds of the Big Bang, around 14.6 billion years ago, but that event makes it impossible to go further. It may be that time only began then - which is why we can't back further, because there is nothing to go to - or it may be that time does go back well beyond that. Whether to only a couple of weeks, or another 20 trillion years, or for an infinite time, is up to what you think.Or possibly a loop in time,Where future and past come together.

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βˆ™ 12y ago
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βˆ™ 15y ago

the earth is 4.6 billion years old, but life has only existed for 4.2 billion years. australopithecus were the oldest living ancestors of the modern human.

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Q: How far back does earth's history go?
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