N a background of microwave electromagnetic radiation with a black-body spectrum discovered in 1965, understood to be the thermal remnant of the big bang with which the universe began 微波背景
microwave background radiation[天] 微波背景辐射
cosmic microwave background宇宙微波背景
universe microwave background宇宙微波背景
Cosmic microwave background radiation[天] 宇宙微波背景辐射
N（名词） a background of microwave electromagnetic radiation with a black-body spectrum discovered in 1965, understood to be the thermal remnant of the big bang with which the universe began 微波背景