行星英语是指在英语中用来描述行星的一种专门用语。它的来源可能源于拉丁语中的 "planetae"，这个词本意是指 "wanderers"，即漂流的星星。

例句：

The eight planets in our solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

(我们太阳系中八大行星是水星、金星、地球、火星、木星、土星、天王星和海王星。)

Pluto was once considered a planet, but it is now classified as a dwarf planet.

(曾经有人认为冥王星是一颗行星，但现在它被归为矮行星。)

A planet's size, composition, and distance from the sun all play a role in its characteristics and behavior.

(行星的大小、构成和离太阳的距离都对它的特性和行为起着重要作用。)

The search for life on other planets is a topic of great interest in astronomy and space exploration.

(在其它行星上寻找生命是天文学和太空探索中一个非常有意思的话题。)