This is the noise that Penzias and Wilson heard -- the oldest sound that you're ever going to hear, the cosmic microwave background radiation left over from the Big Bang.
这就是彭齐亚斯和威尔逊听到的噪音 -- 你能听到的最古老的声音， 自宇宙大爆炸后留下的 宇宙射线背景辐射。