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.
@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.
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