There are nine planets in the solar system.

在系中有九大行。

So what does Tyson maintain is so wrong with Pluto?

泰森为什么要把冥王从九大行中移除？

What say we finish ourselves an eight-planet solar system?

我们一起把那8大行系模型做完吧？

So what's the difference between a small brown dwarf and a really big planet?

那么一颗小褐矮和一颗大行有什么区别呢？

I'm the 2nd largest planet in our solar system.

我是系中第二大行。

Well, a crater ridge on Vesta, a large asteroid, is around 19 kilometers high.

嗯，大行灶神上的陨石坑脊大约有 19 公里高。

All of the giant planets have rings, probably leftover from when the planets formed, and the moons coagulated out of the gas that was there and then it could be a failed moon.

所有的大行都有，或许是来自行形成时的残余物，卫在气体外凝结，而这可能是没有成功的卫。

It's probably older than any rock you can find anywhere on Earth because it formed from the primordial gas cloud, that nebula that collapsed to form the sun and the planets over four and a half billion years ago.

也许比地球上所有的岩石还要久远，这是因为它诞生于最原始的云团，这个云团在 45 亿年前形成了和各大行。

It was a beautiful thing; each of the moons glimmered in place around the nine planets and the fiery sun, all of them hanging in thin air beneath the glass.

这个模型非常美丽，燃烧的、九大行及它们的卫悬浮在玻璃罩中，在各自的位置上熠熠闪烁。

Originally considered a planet following its discovery in 1930, Pluto was regarded as the ninth planet in the solar system for more than 75 years.

1930年首次发现并被认为是行后，它作为系第九大行已超过75年。

NASA provided the image of the rare transit of Mercury, the smallest plant appearing as a tiny black dot on the face of the sun.

航空航天局发布水罕见“穿越”照片，作为八大行中最小的一颗，水形似脸上的黑点。

Holding the idea of a circling system of suns and worlds, it takes the form of these bodies, and moves them as it thinks.

在九大行围绕运转的想法的基础上，母体又逐渐衍生出各大行的实体，并且让它们按照它所规划的体系运动着。

Additionally, the eight known major planets of the solar system currently orbit the sun tilted by six degrees compared to the sun's equator.

此外，系中已知的 8 颗大行目前围绕运行，与的赤道相比，它们的倾角为 6 度。

While standing on his balcony, Wang observes various planets thousands of light-years away with an astronomical telescope and takes pictures of them.

王至璞站在台上，用天文望远镜观察着数千光年之外的各大行，并拍下它们的照片。

Juno's goal is to investigate what the giant planet is made from and how it's put together.

“朱诺”的目的是调查这颗大行的构成成分和形式。

Venus is the sixth largest planet in the Solar System.

体型上，金是系中第6大行。

Callisto orbits Jupiter farthest out of the four biggies, almost two million km away.

在四个大行中，木卫四的公转轨道离木最远，约达200万千米。

It's the glue that holds the planets in orbit around the sun.

它让九大行围绕着旋转。

When Eris was discovered in 2005, it was briefly hailed as a tenth planet, but it sparked a debate in the astronomical community about what makes a planet a planet.

2005年，阋神被发现时，它被称为第十大行，但它引起了天文学界的讨论，讨论针对行的定义。

Planets don't like each other, because they're gravitationally tugging each other.

几大行各自不喜欢对方，几大行各不相同取决于各自的引力。