7 sentences

1. 太阳系由八大行星组成。

   tài​yáng​xì yóu bā dà xíng​xīng zǔ​chéng.

   The solar system is composed of eight major planets.

   Source: Dong Chinese Dictionary

2. 我们不知道有多少个太阳系。

   wǒ​men bù zhī​dào yǒu duō​shao gè tài​yáng​xì.

   We don't know how many solar systems there are.

   Source: OpenSubtitles

3. 木星是太阳系中最大的行星。

   Mù​xīng shì tài​yáng​xì zhōng zuì dà de xíng​xīng.

   Jupiter is the largest planet in the solar system.

   Source: Dong Chinese Dictionary

4. 地球是太阳系中唯一有生命的行星。

   dì​qiú shì tài​yáng​xì zhōng wéi​yī yǒu shēng​mìng de xíng​xīng.

   Earth is the only planet in the solar system that sustains life.

   Source: Dong Chinese Dictionary

5. 金、木、水、火、土是太阳系中的五大行星。

   jīn, mù, shuǐ, huǒ, tǔ shì tài​yáng​xì zhōng de wǔ dà xíng​xīng.

   Mercury, Venus, Mars, Jupiter, and Saturn are the five classical planets in the solar system.

   Source: Dong Chinese Dictionary

6. 火星是太阳系中离地球较近的一颗行星。

   Huǒ​xīng shì tài​yáng​xì zhōng lí dì​qiú jiào jìn de yī kē xíng​xīng.

   Mars is a planet in the solar system that is relatively close to Earth.

   Source: Dong Chinese Dictionary

7. 这部科幻小说讲述了人类移居太阳系外围行星的故事。

   zhè bù kē​huàn xiǎo​shuō jiǎng​shù le rén​lèi yí​jū tài​yáng​xì wài​wéi xíng​xīng de gù​shi.

   This science fiction novel tells the story of humans migrating to the outer reaches of the solar system.

   Source: Dong Chinese Dictionary