the door
Names: the doordoor of the universe
First appears in Book 3: Death's End, chapter 75 (Outside of Time Our Universe)
Appearances
B1
B2
B3
What you know
Book 3: Death's End
- Ch 75The door could send back only a habitability rating from -10 to 10; humans can survive only above zero.
- Ch 75After tens of thousands of jumps over three months, the door found only one habitable planet, rated three, which Sophon called dangerous and inhospitable.