For instance, five of the six planets orbit closer to their parent star than any planets in our solar system orbit the sun.

比如，其6个行星里有5个围绕其母星的轨道距离比我们太阳系里任何一个行星到太阳的轨道距离都要近。

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The eight planets of our solar system orbit in the same direction along what's called the ecliptic, a flat plane that's nearly aligned with the sun's equator.

太阳系中的八大行星都沿着同一方向在被叫作黄道面(这一平面与太阳赤道面形成微小的夹角)运行。

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Far from the sun, in the outer solar system, beyond Jupiter's orbit, temperatures are low enough to permit ices to form out of water and out of gases like methane and carbon dioxide.

在远离太阳的外太阳系，在木星轨道之外，温度低到足以使冰从水以及甲烷和二氧化碳等气体中形成。

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NASA hopes that Dawn's year long orbit around Vesta will help scientists learn more about the development of the solar system, and how asteroids and other space objects were created.

VOA: special.2011.07.27

But part of the problem with the definition - I mean, as an example - is that if you look at Mars - if Mars - if we discovered a Mars-sized object out beyond the orbit of Pluto, it couldn't be a planet, because over the age of the solar system it wouldn't have time to clear its orbit.

NPR: Astronomers Prepare to Fight Pluto Demotion

To date, of the roughly 800 planets catalogued beyond our Solar System, only four are known to orbit stars in a cluster.

BBC: 'Dirty' stars hint at Sun's future

The fact that different bodies in the solar system change their relative positions as they orbit the sun will, Dr Hooke concedes, complicate routing a bit: when the earth and Mars are on opposite sides of the sun, for example, it might be best to send e-mail via Venus.

ECONOMIST: An interplanetary Internet: The wire of the worlds | The