Erid

Location from Project Hail Mary by Andy Weir

Rocky's homeworld — a super-Earth of crushing gravity, ammonia storms, and total darkness, where a civilization of blind engineers built a space elevator and then had to build a starship to save their dying sun.

Also known as: Erid, Rocky's World

What They Know

• Super-Earth: 8.5x Earth mass, 2x gravity, 29 atm pressure, ammonia atmosphere, permanent darkness
• Surface temperature extreme; 5.11-hour day creates rapid thermal cycling
• Civilization developed entirely without visual perception — all technology is auditory/tactile
• Built a space elevator before achieving interplanetary travel
• Grace lives here post-mission in a pressurized dome, teaching Eridian children

Connections

• orbits — forty_eridani
• home_of — rocky

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