Re: If the Sun dissipated ?
I would wager that geothermal energy and fossil fuels could sustain a number of people (probably on the order of magnitude of millions) by growing food with artificial light. Obviously less developed countries would have mass extinction if they do not have a power grid that can deliver extremely large amounts of power for growing mass food under artificial light. Animals that were not pandered by the artificial energy (basically anything thats not a pig, cow or chicken) would die basically within a few months.
Life in general, however, would persist for probably a few million years after that. There is an entire ecosystem under the water that recieves no light based energy, which would be almost completely unaffected.
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