Climate collapse, Fermi paradox
How fucked up would it be to find ruins of a highly technological civilization on Venus?
Venus is totally in the habitable zone (although it has very long days) and the only reason it's so hot is because its dense CO2-rich atmosphere. What if once it had sentient life and they started a runaway global warming...?
This could make an awesome AND terrifying science-fiction story.
@diodelass What if we build giant spaceships which transfer the excess CO2 from Venus to Mars? We get 2 more habitable planets!
Make rocket fuel from CO2, water, and sunlight in floating cities on Venus. Fill solidified CO2 into reusable tanks, send them into low Venus orbit. Take the frozen CO2 out, send back the tanks, and use laser propulsion to send most of the CO2 ice to Mars.
Ditto for Saturn/Jupiter, but those are even more.. involved orbital rings. Skyhooks might also be possible..
https://www.orionsarm.com/ has a bunch of articles from Paul Birch about it https://orionsarm.com/fm_store/Paul%20Birch's%20Page.htm and of course the Lofstrom loop also has a whole article too.
I like OrionsArm, but tbh it lacks detail sometimes.
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