Merry Christmas
this post was submitted on 26 Dec 2023
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Thought it was 5 billion but at this point i don't recall
That's until the life cycle of the sun ends and all it's nuclear fuel will run out, forcing it into red giant, then white dwarf, forms. However, the sun will have expanded enough to make Earth uninhabitable, from what I can find, somewhere in the the neighborhood of 700ish million years, to 1.3 billion years.