You can see them fall during the day, and usually hear the big bang as they hit the ground.
在那天，你可以看到它们落下，通常情况下也能听到它们撞击大地后发出的巨大爆炸声。
They suggested that all particles had no mass just after the Big Bang.
他们提出大爆炸最初所有的粒子都没有质量。
This cosmic microwave background radiation, they said, represents the ancient afterglow of the big bang.
他们说，这宇宙微波背景幅射代表着宇宙大爆炸的余辉。
They have begun to piece together the whole history of the universe, from the big bang to the present day.
他们已着手把宇宙从大爆炸至今的历史拼接起来。
Since they rotate in different directions, the Big Bang had a diverse focus.
因为星系都朝着不同的方向旋转，大爆炸有一个发散的中心。
They found that before the Big Bang, there was a contracting universe.
他们发现在大爆炸发生之前，存在一个收缩的宇宙。
They found that before the Big Bang, there was a contracting universe.
他们发现在大爆炸发生之前，存在一个收缩的宇宙。
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