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This first turns up in Book 1. Come back when you get there.

concept

cosmic microwave background

Names:

First appears in Book 1: The Three-Body Problem, chapter 7 (7)

Appearances

B1

B2

B3

What you know

Book 1: The Three-Body Problem

Ch 9The CMB matches a black body at about 2.7255 K and is nearly uniform; its overall fluctuation should change only over cosmic timescales.
Ch 9At about 1 a.m. the overall CMB fluctuates visibly in sync across three satellites and the Ürümqi observatory, so the universe flickers.

An unofficial, spoiler-aware fan guide to Remembrance of Earth's Past by Cixin Liu. Nothing past your reading progress is shown. Book details and covers from Open Library.

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