而在较深的海域，波浪逆向流动相互撞击，由此产生的脉冲力能一直传递到海底，它所引起的震动能够传到很远的距离之外。
In deeper waters, waves traveling in nearly opposite directions create a pulse that travels all the way to the ocean floor and causes new vibrations that can travel long distances.
由于观测距离很远，光线要花很长时间才能到达地球，天文学家才能在现代观察到遥远的过去的景象。
By looking very far away, because the light takes so long on its journey to reach the Earth, astronomers are effectively able to look back in time to this early era.
尽管38度似乎是一个很远的距离（月亮大小的80倍左右），费米航天器上的大范围望远镜却可以一次观察到特别大的一部分天空。
While 38 degrees seems like a big distance (it is around 80 times larger than the size of the moon), the Large Area Telescope on Fermi sees a huge fraction of the sky at once.
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