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单词 microwave background radiation
释义 microwave background radiation
A cosmic background of radiation in the frequency range 3 × 1011 hertz to 3 × 108 hertz discovered in 1965. Believed to have emanated from the primordial fireball of the big bang with which the universe is thought to have originated (see big-bang theory), the radiation has an energy density in intergalactic space of some 4 × 10-14 J m-3
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更新时间:2025/6/23 1:56:00