太阳系仪太阳系的机械模型 A mechanical model of the solar system.
火星是太阳系的第四颗行星。 Mars is the fourth planet in order from the sun.
木卫三木星四颗最亮的卫星之一,距木星的远近程度是第八位。最早伽利略观察到,是太阳系最大的卫星之一 One of the four brightest satellites of Jupiter and the eighth in distance from the planet. Originally sighted by Galileo, it is one of the largest satellites in the solar system.
行星学天文学的一个分支,研究太阳系中的行星、卫星和流星 The branch of astronomy that deals with the planets, satellites, and meteors of the solar system.
我们太阳系的行星有水星、金星、地球、火星、木星、土星、天王星和海王星。 The planets of our solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.