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...?

I wonder if it's possible that an artificial satellite orbiting Venus would have remained invisible to this day. If it has a small enough radar cross-section and stable orbit...

I wish I would know more astronomy.

/cc @anne

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This could make an awesome AND terrifying science-fiction story.

@uint8_t oh gosh we love this idea

one of the old ideas of scifi is that the sun is cooling down over time, and so Mars is the old dead world, Earth is the current one, and Venus is the infant to eventually take Earth's place.

and, welp, turns out that's backwards, the sun is *brightening* over time

but it would definitely be cool to see that trope reversed with nothing to do with the sun at all - now it's life that heats up planets.

Venus was then, Earth is now, Mars is next.

@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.

@uint8_t @diodelass i think orbital rings make more sense than rockets.

Ditto for Saturn/Jupiter, but those are even more.. involved orbital rings. Skyhooks might also be possible.. has a bunch of articles from Paul Birch about it and of course the Lofstrom loop also has a whole article too.

I like OrionsArm, but tbh it lacks detail sometimes.

@diodelass @uint8_t I'm not sure there's any hope of Mars springing to life (alas) without intelligent intervention - there really isn't enough hydrogen to make oceans. This is a general problem throughout the inner solar system, where small bodies and high temperatures let water escape to space.

With intelligent intervention, well, we might learn to live in current Martian conditions, or we might drop comets on it for a (temporary but long) bunch of extra hydrogen.

@uint8_t I saw an article about a similar hypothesis, but on Earth, several million years ago during one of the mass extinction, as the period was hotter than today, and was following a rapid increase of CO2 in the atmosphere.

@Feufochmar But how much carbon is still in hydrocarbon and coal form on our planet? What if we burn everything? (if the atmosphere gets depleted, we can liberate oxygen from minerals, it's just a matter of energy)

@uint8_t pretty sure I’ve already read one like this but about Mars.

Also modern time JG Ballard has some corker post apocalyptic fiction like:

The Drowned World is a 1962 science fiction novel by British writer J. G. Ballard. The novel depicts a post-apocalyptic future in which global warming has caused the majority of the earth to become uninhabitable.

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