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HOW MANY YEARS EARTH WILL ALIVE?
The Earth is currently 4.5 billion years old (known from several convergent lines of evidence).

If the Earth does not get smashed by a planetoid, it could last another 5 billion years. In about 5 billion years time the sun will have fused most of its lighter elements, like hydrogen and helium, into heavier elements, and then expand into a red giant, which will fry the Earth's atmosphere, leaving a lifeless planet.


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