太阳系 20180206

- Do you remember how many planets there are in our solar system? - Eight. - Great, and do you remember their names? - Yes, they are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. - Wow, good for you. - And can you tell me the story of Pluto? - Pluto is the farthest from the sun, and it used to be called a planet, but astronomers now call it a dwarf planet.   - 你记得太阳系有多少颗行星吗？ - 八颗。 - 真不错，那你还记得它们的名字吗？ - 记得，它们是水星、金星、地球、火星、木星、土星、天王星和海王星。 - 哇，你好厉害！ - 那你可以给我讲讲冥王星的故事吗？ - 冥王星离太阳最远，以前它也被称为行星，但是天文学家现在称它为矮行星。