小行星 (xiǎo xíngxīng) means "asteroid." It literally translates to "small planet" and refers to the rocky bodies that orbit the sun, primarily found in the asteroid belt between Mars and Jupiter.
科学家发现了一颗新的小行星。
Kēxuéjiā fāxiàn le yī kē xīn de xiǎo xíngxīng.
Scientists have discovered a new asteroid.
那颗小行星的直径大约有五百米。
Nà kē xiǎo xíngxīng de zhíjìng dàyuē yǒu wǔbǎi mǐ.
The diameter of that asteroid is approximately five hundred meters.
小行星撞击地球的可能性非常小。
Xiǎo xíngxīng zhuàngjī dìqiú de kěnéngxìng fēicháng xiǎo.
The possibility of an asteroid striking Earth is extremely small.