Even fifteen billion years or so after the Big Bang, echoes of that event still linger in the form of background radiation, only a few degrees above absolute zero.

• 即使在宇宙大爆炸发生大约150亿年之后，大爆炸的遗迹仍以背景辐射的形式存在于茫茫宇宙之中，这背景辐射只高出绝对温度几度。