If our Universe is open, either flat or hyperbolic in geometry, then it will expand forever… or at least until space-time’s warranty expires and a new vacuum is born from some quantum flip. Prior to that, most likely immensely distant, event the regular stars will go out and different sources of energy will be needed
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Space Solar Power Satellite Kurzweil Accelerating Intelligence News reports that a major decadal study of space solar power has been completed, and I must say it is very thorough. Here’s the news link… A limitless power source for the indefinite future …the PowerSats described mass ~10,000 tonnes per GW delivered to the ground, at about
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James Lovelock once estimated Earth’s biosphere would crash in about 100 million years when carbon dioxide levels dropped too low. James Kasting and Ken Caldeira updated the model to include a different photosynthetic cycle amongst land plants, pushing back Doomsday to about 900 million years in the Future. Those “900 million years” before Earth overheats
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