Venus

Location from Project Hail Mary by Andy Weir

The CO2-choked planet where Sol's Astrophage breed — humanity's crisis nursery, orbiting one planet over.

Venus is where Sol's Astrophage population reproduces. The organisms migrate from the Sun along magnetic field lines, lock onto Venus's CO2-rich atmosphere via carbon dioxide spectral lines, breed in the upper atmosphere, and return to the Sun with their offspring to feed. This migration path is the Petrova line — the infrared arc that Dr. Petrova first identified and that started the entire chain of events. Venus cannot host Taumoeba naturally because the nitrogen in its atmosphere is lethal to the wild strain. Breeding a nitrogen-resistant Taumoeba variant (strain 82.5) and deploying it to Venus is the mission's ultimate goal — break the breeding cycle here, and Sol's Astrophage population collapses.

Appearance

Earth's toxic twin — dense CO2 atmosphere, crushing surface pressure, no visible surface from orbit. The Petrova line — an infrared arc of migrating Astrophage — connects Venus to the Sun in a visible thread of slow-motion stellar death.

Also known as: Venus

What They Know

• Sol's Astrophage breeding ground — they migrate here via the Petrova line to reproduce in CO2 atmosphere
• Cannot host natural Taumoeba due to nitrogen content — requires engineered nitrogen-resistant strain
• Breaking the breeding cycle here is the key to saving Earth's sun
• The Petrova line connecting Venus to Sol was the first visible sign of the Astrophage crisis

Connections

• breeding_ground_of — astrophage

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