Earth's moon has become a military-restricted refuge and political center, the destination of both the Rocinante's delegation and Amos's unauthorized rescue shuttle.
Luna is the destination of Prime Minister Smith, Avasarala's emergency coordination, and the Rocinante's flight from Tycho. Its defended orbital space is now under military restriction as Earth reels from the attacks and the surviving governments attempt to assemble a response.
When the unapproved Zhang Guo reaches orbit from Earth, Luna Base orders it to identify itself or be fired upon. Amos invokes Avasarala to seek safe passage, making the moon the immediate refuge for a civilian escape group as well as the coming center of high-level negotiations.
A gray airless moon marked by a thin bright limb, webbed city lights, military traffic control, and the distant blaze of the sun above devastated Earth.
Luna is the guarded near-Earth haven where scattered survivors and political leaders are converging.