These disks are the remnants of planetary formation.

这些圆盘是行星形成的剩余物.

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

根据行星形成的模型，这是不可能的！

Should Mercury be stripped of its planetary status?

那么水星应该被剥夺其行星地位吗？

It's going to some other planetary system.

而是去了其它星系。

That's a very common shape for planetary nebulae.

这是行星状星云很常见的形状。

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

史密森尼学会台说，这是有史以来第一次从一个行星体中到它们。

So some planetary systems are aligned just so.

所以有些行星系就是这样排列的。

Jay Melosh studies planetary impacts at Purdue University.

在普渡大学研究行星撞击的杰伊·梅洛什说到。

Mercury brushes against another planetary embryo.

水星与一颗胚胎期行星擦肩而过。

This explosive planetary drama demands a dynamic human response.

这场爆炸性的地球戏剧需要人类作出积极的反应。

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

一个，一片死寂形成于大量碰撞。

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

行星学家海蒂∙海莫向NASA递交了一项建议。

The timing issue has everything to do with planetary mechanics.

这一时间安排与行星力学有很大关系。

Or is the planetary model of the atom doubly wrong?

或是行星原子模型又错了?

The planetary safety boundary of 1.5 degrees has not been reached.

地球还没有达到1.5度的安全界限。

Only one planetary defense method has been tried against an asteroid.

目前只有一种行星防御方法被尝试用来抵御小行星。

The rockets will be used to study physics and planetary science.

这些火箭将用于研究物理学和行星科学。

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

我们也知道所有恒星都由完全形成的行星系统环绕。

Bruce Banerdt, a planetary geophysicist at the Jet Propulsion Lab in California.

加州喷气推进实验室的行星地球物理学家布鲁斯·巴纳特说到。

Now two new studies posted at arxiv.org have strengthened the planetary argument.

目前，两项发表在 arXiv.org 上的新研究强化了行星论论点。