The only reasonable interpretation is that this background is radiation left over from an early hot and dense state.
唯一合理的解释是这一情况是宇宙早期处于炎热而密度大的状态时遗留下来的辐射。
Our whole universe was in a hot dense state, Then nearly fourteen billion years ago expansion started. Wait...
我们的宇宙曾处于炎热致密的状态，然后大约一百四十亿年前它开始膨胀。
Our whole universe was in a hot dense state, Then nearly fourteen billion years ago expansion started. Wait...
我们的宇宙曾处于炎热致密的状态，然后大约一百四十亿年前它开始膨胀。
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