The Milky Way could fit inside

宇宙是银河系的

10 million million million times.

一千亿亿倍

Our entire galaxy's just a dot on the landscape.

整个星系只是宇宙中的一个小点

In the observable universe,

在可观测宇宙中

there are 170 billion galaxies just like it.

有一千七百亿类似的星系

Janna Levin is a professor of theoretical astrophysics.

扬娜·莱文是一名理论天体物理学的教授

She'd like to put every single galaxy we can see on the map.

她想把可观测到的每个星系都绘制出来

But, before she can do that,

但在此之前

it's vital to account

我们需要先弄清楚

for one of the most surprising features of the universe.

宇宙的一个惊人特征

Making a map of the whole universe

绘制宇宙之图

is not like mapping a map of the United States.

不同于绘制美国地图

It's an observational fact that,

据长久以来的观测

if you look at the galaxies around us,

如果我们看周围的星系

and the most distant galaxies that we can see,

以及离我们最远的星系

they all appear to be moving away from us.

你会发现它们都在离我们而去

重点解释：

1.look at （仔细地）看

例句：Don't look at me like that.

别那样看着我。

2.appear to 看来似乎

例句：These stars appear to move around the North Star.

这些星星似乎环绕着北极星转。

3.away from 离开

例句：He hasn't been away from home before.

以前他从没有离开过家。