Pinyin/Pluto

Pluto 's volume is the largest in the known dwarf planets, the largest in the Kuiper Belt objects, and probably the largest in the trans-Neptunian objects. It is the ninth largest of volume in the sky objects which directly moves around the sun. Pluto is the same with other Kuiper Belt objects which is composed mostly of rocks and ice. It is relatively small, just 1/6 of the mass of the moon, and 1/3 of the volume of the moon.

Míngwángxīng de tǐjī shì yǐzhī ǎixíngxīng zhōng zuìdà, Kuiper Xīngdài tiāntǐ zhōng zuìdà, yě hěn kěnéng shì Hǎiwángxīng-wài tiāntǐ zhōng zuìdà de. Tā shì zhíjiē wéirào Tàiyáng yùnxíng de tiāntǐ zhōng tǐjī dì-9 dà de. Míngwángxīng tóng qítā Kuiper Xīngdài tiāntǐ yīyàng zhǔyào yóu yánshí hé bīng zǔchéng. Tā xiāngduì jiàoxiǎo, zhǐyǒu Yuèqiú zhìliàng de 1/6, Yuèqiú tǐjī de 1/3.

Pluto's orbital eccentricity and inclination are high, the perihelion is 30 astronomical units (4.4 billion kilometers), the aphelion is 49 astronomical units (7.4 billion kilometers). Therefore, Pluto enters the inside of the orbit of Neptune periodically. Neptune and Pluto will not collide because of their orbital resonance. In 2014, the distance of Pluto from the sun is 32.6 astronomical units. On its average distance (39.4 astronomical units), sunlight needs about 5.5 hours to reach Pluto.

Míngwángxīng de guǐdào líxīnlǜ hé qīngxiéjiǎo dōu jiàogāo, jìnrìdiǎn wéi 30 tiānwén dānwèi (44 yì qiānmǐ), yuǎnrìdiǎn wéi 49 tiānwén dānwèi (74 yì qiānmǐ). Míngwángxīng yīncǐ zhōuqīxìng jìnrù Hǎiwángxīng guǐdào nèicè. Hǎiwángxīng yǔ Míngwángxīng yīnwèi xiānghù de guǐdào gòngzhèn suǒyǐ bùhuì pèngzhuàng. 2014 nián Míngwángxīng jùlí Tàiyáng 32.6 tiānwén dānwèi. Zài tā de píngjūn jùlí shàng (39.4​​ tiānwén dānwèi), yángguāng xūyào 5.5 xiǎoshí zuǒyòu cáinéng dàodá Míngwángxīng.