評論
打印
We can only see light.
我們只能看見光
And light moves at a certain speed.
而光在以一定的速度運動
And so, as we look farther and farther away,
所以 我們看得越遠
we're looking farther and farther back in time
看到的事物也就越古老
because we're seeing light coming to us from long ago.
因為我們看到的光是很久以前發出的
But there's only so far we can go back in time.
但是宇宙的歷史是有限的
So there's only so far we can see.
所以我們能看見的范圍也很有限
It's called the "Observable universe".
這稱為 可觀測宇宙
We can only map what's inside,
我們只能繪出在它范圍內的物體
because the universe is only 13.7 billion years old.
因為宇宙只有137億年的歷史
There may well be a lot more universe outside,
在這范圍之外可能還有更廣闊的宇宙
but the light hasn't had time to reach us yet.
但是它們發出的光還未到達地球
In the last 20 years, we've seen this tremendous expansion,
過去的二十年間 我們掌握了許多知識
both in the amount and in the precision of knowledge
對可觀測宇宙的了解
that we have about the observable universe.
實現了量的積累和質的飛躍
This has allowed cosmologists
這為宇宙學家
to make a map of unbelievable scale.
制作如此宏偉的星圖奠定了基礎
重點解釋：
1.long ago 很久以前
例句：Amber is the resin of pine trees that grew very very long ago.
琥珀是古老的松脂。
2.so far 迄今為止
例句：It's the hottest day I've had so far.
這是迄今為止我經歷的最熱的一天。
