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The hypothetical tag is used for questions about processes that are unlikely to occur, but which may act as useful thought experiments and provide general insight into the processes in question.
23
votes
What would be the first thing which will render the Earth uninhabitable?
I'll try to put time scales on each of these events.
The Sun as a red giant - 5 to 6 billion years$^1$
The Sun is currently on the main sequence, which means that it's a "full grown" star - think o …