孛
ハイ, ブツ, ボツ

comet, dark, obscure

JLPT0 G13 S0 F5000

Originally, 八# split right and left + an element combining 屮 grass shoot and 子 child/offspring → young living things bursting upward and outward → *spring up* (compare 撥). The compound 孛 星 refers to a comet.

[Full Kanji Etymology List]