The Smithsonian Institution says they were the first ever retrieved from another planetary body.

史密森尼学会天文台说，这是有史以来第一次从另一个行体中找到它们。

These disks are the remnants of planetary formation.

这些圆盘是行形成剩余物质.

According to planetary formation models, that wasn't possible!

根据行形成，这是不可能！

The other, a planetary carcass gouged by millions of high velocity impacts.

另一个，一片死寂形成于大量碰撞。

That's a very common shape for planetary nebulae.

这是行状云很常见形状。

Should Mercury be stripped of its planetary status?

那么水应该被剥夺其行地位吗？

It's going to some other planetary system.

而是去了其它系。

We who cannot even put our own planetary home in order.

我们，尚不能整治自球我们。

By the time we're ready to settle even the nearest other planetary systems.

到那时，我们准备好移民到即使是最近球时候。

And from there, be able to map out a timeline of planetary development.

接着我们就能描绘出行演变整个过程。

And we see all the stars surrounded by completed planetary systems.

我们也知道所有恒都由完全形成行系统环绕。

The mission which launched months ago has been called humanity's first test of planetary defense.

几个月前发射这一任务被称为人类对行防御第一次测试。

And so, this was NASA's first ever planetary defense test mission.

这是NASA第一次行防御测试任务。

So some planetary systems are aligned just so.

所以有些行系就是这样排列。

However, most planetary scientists still do, which is why we're using that terminology here.

但是，绝大部分行科学家还是认为冥王是行，这就是我们使用这个术语原因。

Jay Melosh studies planetary impacts at Purdue University.

在普渡大学研究行撞击杰伊·梅洛什说到。

We have found so many different kinds of planetary systems in the galaxy.

我们在这个系中发现了很多不同种类行系统。

Mann added that he believes this pattern " is connected to human-caused planetary warming" .

曼恩补充说，他相信这种式" 与人类造成地球变暖有关" 。

That planetary heat causes all of this chaotic change, which we could call climate change.

行热量导致了所有这些混乱变化，我们可以称之为气候变化。

So planetary astronomer, Heidi Hammel, submits a proposal to NASA.

行天文学家海蒂∙海莫向NASA递交了一项建议。